Allen, D. S., & Ordway, R. J. (1968). Physical science (2nd ed.). Van Nostrand renhold Co..
Lua i Stíl Chicago (17ú heag.)Allen, Donald S., agus Richard J. Ordway. Physical Science. 2nd ed. New York: Van Nostrand renhold Co., 1968.
Lua MLA (9ú heag.)Allen, Donald S., agus Richard J. Ordway. Physical Science. 2nd ed. Van Nostrand renhold Co., 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.