calculator | = C = | can

Camel Book n.

Universally recognized nickname for the book "Programming Perl", by Larry Wall and Randal L. Schwartz, O'Reilly and Associates 1991, ISBN 0-937175-64-1 (second edition 1996, ISBN 1-56592-149-6; third edition 2000, 0-596-00027-8, adding as auhors Tom Christiansen and Jon Orwant but dropping Randal Schwartz). The definitive reference on Perl.

calculator | = C = | can