Cita APA (7th ed.)
Graham, E. H. (1946). Natural principles of land use: (2. print.). Oxford Univ. Pr.
Cita Chicago (17th ed.)
Graham, Edward Harrison. Natural Principles of Land Use: (2. Print.). London [usw.]: Oxford Univ. Pr, 1946.
Cita MLA (9th ed.)
Graham, Edward Harrison. Natural Principles of Land Use: (2. Print.). Oxford Univ. Pr, 1946.
Atenció: Aquestes cites poden no estar 100% correctes.