Cita APA (7th ed.)
MacDougal, D. T., & Working, E. B. (1933). The pneumatic System of plants, especially trees.
Cita Chicago (17th ed.)
MacDougal, Daniel Trembly, i Earl Booth Working. The Pneumatic System of Plants, Especially Trees. Washington, 1933.
Cita MLA (9th ed.)
MacDougal, Daniel Trembly, i Earl Booth Working. The Pneumatic System of Plants, Especially Trees. 1933.
Atenció: Aquestes cites poden no estar 100% correctes.