Johnston, C. L. (1970). Plane trigonometry: A new approach. Appleton-Century-Crofts.
Chicago Style (17th ed.) CitationJohnston, Carol Lee. Plane Trigonometry: A New Approach. New York: Appleton-Century-Crofts, 1970.
MLA (9th ed.) CitationJohnston, Carol Lee. Plane Trigonometry: A New Approach. Appleton-Century-Crofts, 1970.
Warning: These citations may not always be 100% accurate.