APA (7th ed.) Citation

Nielsen, K. L. (1954). Plane and spherical trigonometry. Barnes and Noble.

Chicago Style (17th ed.) Citation

Nielsen, Kaj L. Plane and Spherical Trigonometry. New York: Barnes and Noble, 1954.

MLA (9th ed.) Citation

Nielsen, Kaj L. Plane and Spherical Trigonometry. Barnes and Noble, 1954.