Cita APA

Frayer, W. E., & Hefner, J. (1991). Florida wetlands: Status and trends, 1970´s to 1980´s. Atlanta, Georgia: U.S. Fish and Wildlife.

Citación estilo Chicago

Frayer, W. E., y J.M Hefner. Florida Wetlands: Status and Trends, 1970´s to 1980´s. Atlanta, Georgia: U.S. Fish and Wildlife, 1991.

Cita MLA

Frayer, W. E., y J.M Hefner. Florida Wetlands: Status and Trends, 1970´s to 1980´s. Atlanta, Georgia: U.S. Fish and Wildlife, 1991.