APA Style

Sales, R. (1978). Children's Britanica : INDEX and ATLAS (VOLUME 20) (Third Edition, 1973, revised 1978). London: Encyclopaedia Britannica International.

MLA Style

Sales, Robin. "Children's Britanica : INDEX and ATLAS (VOLUME 20)". Third Edition, 1973, revised 1978 London: Encyclopaedia Britannica International, 1978. Text.