Cita APA (7th ed.)
Allen, D. S., & Ordway, R. J. (1968). Physical science (2nd ed.). Van Nostrand renhold Co..
Cita Chicago (17th ed.)
Allen, Donald S., i Richard J. Ordway. Physical Science. 2nd ed. New York: Van Nostrand renhold Co., 1968.
Cita MLA (9th ed.)
Allen, Donald S., i Richard J. Ordway. Physical Science. 2nd ed. Van Nostrand renhold Co., 1968.
Atenció: Aquestes cites poden no estar 100% correctes.