Cita APA (7th ed.)

JOHNSON Leon J. (1979). Introductory soil science: A study guide and laboratory manual. Macmillan.

Cita Chicago (17th ed.)

JOHNSON Leon J. Introductory Soil Science: A Study Guide and Laboratory Manual. New York: Macmillan, 1979.

Cita MLA (9th ed.)

JOHNSON Leon J. Introductory Soil Science: A Study Guide and Laboratory Manual. Macmillan, 1979.