Cita APA (7th ed.)
Head, K. H. (1980). Manual of soil laboratory testing: Vol. 1. Pentech Pr.
Cita Chicago (17th ed.)
Head, K. H. Manual of Soil Laboratory Testing: Vol. 1. London: Pentech Pr, 1980.
Cita MLA (9th ed.)
Head, K. H. Manual of Soil Laboratory Testing: Vol. 1. Pentech Pr, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.