Cita APA (7a ed.)

Kells, L. M., Kern, W. F., & Bland, J. R. (1940). Plane and spherical trigonometry (Second edition.). McGraw-Hill Book Company, Inc.

Cita Chicago Style (17a ed.)

Kells, Lyman M., Willis F. Kern, y James R. Bland. Plane and Spherical Trigonometry. Second edition. New York: McGraw-Hill Book Company, Inc, 1940.

Cita MLA (9a ed.)

Kells, Lyman M., et al. Plane and Spherical Trigonometry. Second edition. McGraw-Hill Book Company, Inc, 1940.