Engelsohn, H. S. (1981). Trigonometry : a complete and concrete approach / Harold S. Engelsohn: A complete and concrete approach. McGraw-Hill.
Chicago Edition CitationEngelsohn, Harold S. Trigonometry : A Complete and Concrete Approach / Harold S. Engelsohn: A Complete and Concrete Approach. New York ; London: McGraw-Hill, 1981.
MLA Edition CitationEngelsohn, Harold S. Trigonometry : A Complete and Concrete Approach / Harold S. Engelsohn: A Complete and Concrete Approach. McGraw-Hill, 1981.
Warning: These citations may not always be 100% accurate.