Cita APA (7a ed.)

Johnson, E. J., & Hollenberg, A. H. (1950). Servicing and maintaining farm tractors. McGraw-Hill.

Cita Chicago Style (17a ed.)

Johnson, Elmer J., y Alvin H. Hollenberg. Servicing and Maintaining Farm Tractors. New York: McGraw-Hill, 1950.

Cita MLA (8a ed.)

Johnson, Elmer J., y Alvin H. Hollenberg. Servicing and Maintaining Farm Tractors. McGraw-Hill, 1950.