Cita APA (7th ed.)

Barrera, A., & Tabayoyong, F. T. (1977). Principles of soil science. [Don Bosco Print. Press].

Cita Chicago (17th ed.)

Barrera, Alfredo, i Filomeno T. Tabayoyong. Principles of Soil Science. [Makati, Metro Manila]: [Don Bosco Print. Press], 1977.

Cita MLA (9th ed.)

Barrera, Alfredo, i Filomeno T. Tabayoyong. Principles of Soil Science. [Don Bosco Print. Press], 1977.