Books by Graeme Donald Robertson:
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Robertson, Graeme Donald: A Practical Introduction to APL 1 and APL 2 (third edition; Basingtoke, UK: Robertson, 2008) (PDF at aplteam.com)- Robertson, Graeme Donald: A Practical Introduction to APL 3 and 4, Featuring Dyalog Versions 10 and 11 (third edition; Basingtoke, UK: Robertson, 2008) (PDF at aplteam.com)
Find more by Graeme Donald Robertson at your library, or elsewhere.