If you never knew there were full-length novels written for NieR:Automata, you can find the pertinent information about them below.
The 3 NieR:Automata Novels
Long Story Short (長イ話, lit. A Long Story)
ーNovelization of the NieR:Automata game

- Japanese Release:
Square Enix, August 5, 2017 - English Release:
VIZ Media, October 9, 2018
Short Story Long (短イ話, lit. A Short Story)
ーCollection of NieR:Automata related novellas/short stories plus the novelization of the original YoRHa stage play

- Japanese Release:
Square Enix, October 24, 2017 - English Release:
VIZ Media, April 9, 2019
YoRHa Boys (少年ヨルハ)
ーNovelization of the YoRHa Boys Stage Play
(not to be confused with the YoRHa Ver.1.3a Stage Play)

- Japanese Release:
Square Enix, July 27, 2018 - English Release:
Square Enix, October 27 2020
Related Topics and Information
All About the YoRHa Stage Plays
January 18, 2016 – A comprehensive look at the YoRHa stage plays from its inception to NieR:Automata and beyond. Includes detailed information on each of the seven productions.
[Excerpt]
What is “YoRHa”? A Quick Definition:
The storyline of “YoRHa” was the product of Yoko Taro. He collaborated with MONACA and DearStage among others to create a story that involves traditional Japanese idols who sing, dance, and later perform in the YoRHa stage play. This story later became the basis for the game NieR:Automata.
A First Look at the NieR:Automata Novel “A Short Story” (Japanese: 長イ話 Nagai Hanashi)
August 5, 2017 – An initial look at the Japanese release, including brief summary translations, hexadecimal code translations, illustrations, and more.
A Quick Look at the NieR:Automata Novel “A Short Story”
October 25, 2017 – A quick look at the novel, including brief translations and illustrations.
The YoRHa Musical and YoRHa Boys Stage Play, Interview by Famitsu
January 12, 2018 – A first look at the two separate stage productions with interview by Famitsu translated into English.
The NieR:Automata Novels Published by VIZ Media – A Shameless Critique
April 12, 2019 – A not-so brief critique of the English translation of the first NieR:Automata novel Nagai Hanashi aka Long Story Short, released by VIZ Media.
YoRHa Boys Novel
July 28, 2019 – Initial look at the Japanese release, including brief summary translations and illustrations.
3rd NieR:Automata Novel “YoRHa Boys” to be Localized in English
November 20, 2019 – Announcement of the English release, additional background on the novel and the stage play it was based on.
[Excerpt]
A couple days ago, it was announced that the 3rd NieR:Automata novel “YoRHa Boys” will be localized for a fall release in 2020. Since this news has come out, there have been several misinterpretations regarding this “new” novel, so allow me to explain a little further in depth on the topic.
This is not a “new” novel. As it stands now, there have been three separate, full-length novels released in the NieR:Automata series. The “YoRHa Boys” novel, originally released in July 2018, is actually a novelized version of the stage play by the same name, which ran from January 31 to February 4th, 2018.
YoRHa Stage Play Differences
October 12, 2020 – A closer look at the main differences between each version, focusing on the production side as well as pin-pointing which characters do or do not appear.