The 1000 Revision Problems were sourced from https://howardmathematics.com/

Amiyuki7's PDF was sourced from here https://discord.com/channels/1307893801670410340/1307894203673481227/1406549324283904060 in the nswmaths discord, join here https://discord.com/invite/HKcXx4dEQX 

Proof compilation by Aeonium on this thread https://boredofstudies.org/resources/compilation-of-proof-questions.20852/