Cita APA (7th ed.)

COWAN, H. J., & SMITH, P. R. (1983). Environmental systems. Van Nostrand Reinhold.

Cita Chicago (17th ed.)

COWAN, Henry J., i Peter R. SMITH. Environmental Systems. New York: Van Nostrand Reinhold, 1983.

Cita MLA (9th ed.)

COWAN, Henry J., i Peter R. SMITH. Environmental Systems. Van Nostrand Reinhold, 1983.