' "Square two" is one of three longer courses prepared by the B.B.C. in conjunction with the National Extension College of Cambridge and first broadcast in 1970 ... The course consists of 30 television programmes, divided into 3 terms, each with a corresponding volume of this textbook...' - Introduction.
Square two : a second start in mathematics; [in 3vols]. Term 2, text and examples by Douglas Quadling, Hilary Shuard, Albert Lawrence; edited by David Roseveare. ISBN 0563093676. Published by British Broadcasting Corporation in 1970. Publication and catalogue information, links to buy online and reader comments.