APA (7th ed.) Citation

Langley, R. (1971). Practical statistics simply explained (Rev. ed.). Dover.

Chicago Style (17th ed.) Citation

Langley, Russell. Practical Statistics Simply Explained. Rev. ed. New York: Dover, 1971.

MLA (9th ed.) Citation

Langley, Russell. Practical Statistics Simply Explained. Rev. ed. Dover, 1971.