Παραπομπή APA

Longley-Cook, L. H. (1970). New math puzzles book. Van Nostrand Reinhold.

Παραπομπή Chicago Style

Longley-Cook, L. H. New Math Puzzles Book. New York: Van Nostrand Reinhold, 1970.

Παραπομπή MLA

Longley-Cook, L. H. New Math Puzzles Book. Van Nostrand Reinhold, 1970.