APA (7th ed.) Citation

Hunter, G. W., & Knapp, R. A. j. a. (1939). Mastery tests in general science, set X. American book company.

Chicago Style (17th ed.) Citation

Hunter, George William, and Roy A. joint author Knapp. Mastery Tests in General Science, Set X. New York, Cincinnati [etc.]: American book company, 1939.

MLA (9th ed.) Citation

Hunter, George William, and Roy A. joint author Knapp. Mastery Tests in General Science, Set X. American book company, 1939.