Gaya APA

Hart, W, L., Waits, B, K. (1978). College algebra and trigonometry Ed.2 (2). United States of America: D.C. Heath ad Company.

Gaya MLA

Hart, William, L.., Waits, Bert, K.. "College algebra and trigonometry Ed.2". 2 United States of America: D.C. Heath ad Company, 1978. Text.