Berkey, D. D. (1988). Calculus (2nd ed.). Saunders college.
Lua i Stíl Chicago (17ú heag.)Berkey, Dennis D. Calculus. 2nd ed. New York: Saunders college, 1988.
Lua MLA (9ú heag.)Berkey, Dennis D. Calculus. 2nd ed. Saunders college, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.