30.10.2. ARM official bibliography
The official manuals were stored in http://infocenter.arm.com but as of 2017 they started to slowly move to https://developer.arm.com.
Each revision of a document has a "ARM DDI" unique document identifier.
The "ARM Architecture Reference Manuals" are the official canonical ISA documentation document. In this repository, we always reference the following revisions:
Bibliography: https://www.quora.com/Where-can-I-find-the-official-documentation-of-ARM-instruction-set-architectures-ISAs