Cita APA (7a ed.)

Hobbs, G. M. (1972). Practical mathematics (3rd.ed.). American technical.

Cita Chicago Style (17a ed.)

Hobbs, Glen M. Practical Mathematics. 3rd.ed. Illinois: American technical, 1972.

Cita MLA (9a ed.)

Hobbs, Glen M. Practical Mathematics. 3rd.ed. American technical, 1972.