Cita APA

Heer, J. E., & Hagerty, D. J. (1977). Environmental assessments and statements. New York: [s.n.].

Citación estilo Chicago

Heer, John E., y D. Joseph Hagerty. Environmental Assessments and Statements. New York: [s.n.], 1977.

Cita MLA

Heer, John E., y D. Joseph Hagerty. Environmental Assessments and Statements. New York: [s.n.], 1977.