APA
Palmer Claude Irwins, Leigh Charles Wilbur, . (1950). Plane and spherical trigonometry. New York: Mcgraw Hill Book Company.
Chicago
Palmer Claude Irwins, Leigh Charles Wilbur, . 1950. Plane and spherical trigonometry. New York: Mcgraw Hill Book Company.
Harvard
Palmer Claude Irwins, Leigh Charles Wilbur, . (1950). Plane and spherical trigonometry. New York: Mcgraw Hill Book Company.
MLA
Palmer Claude Irwins, Leigh Charles Wilbur, . Plane and spherical trigonometry. New York: Mcgraw Hill Book Company. 1950.