Cita APA (7th ed.)

Townsend, W. N. (1973). An introduction to the scientific study of the soil (5a. ed.). Edward Arnold.

Cita Chicago (17th ed.)

Townsend, W. N. An Introduction to the Scientific Study of the Soil. 5a. ed. Londres: Edward Arnold, 1973.

Cita MLA (9th ed.)

Townsend, W. N. An Introduction to the Scientific Study of the Soil. 5a. ed. Edward Arnold, 1973.