30.10.2.2. ARMv8 architecture reference manual
Latest version: https://developer.arm.com/docs/ddi0487/latest/arm-architecture-reference-manual-armv8-for-armv8-a-architecture-profile
Versions are determined by two letteres in lexicographical order, e.g.:
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a
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af
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aj
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aj
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b
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ba
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bb
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ca
The link: https://static.docs.arm.com/ddi0487/ca/DDI0487C_a_armv8_arm.pdf is the ca version for example.
The official comprehensive ARMv8 reference.
ISA quick references can be found in some places: