SELBY, P. H. (1964). Trigonometry self-taught: A simplified, programmed course. McGraw-Hill.
Chicago Style (17. basım) AtıfSELBY, Peter H. Trigonometry Self-taught: A Simplified, Programmed Course. New York: McGraw-Hill, 1964.
MLA (9th ed.) AtıfSELBY, Peter H. Trigonometry Self-taught: A Simplified, Programmed Course. McGraw-Hill, 1964.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..