Cita APA (7a ed.)

Sopper, W. E., & Kerr, S. N. (1979). Utilization of municipal sewage effluent and sludge on forest and disturbed land. Pennsylvania State University Press.

Cita Chicago Style (17a ed.)

Sopper, William E., y Sonja N. Kerr. Utilization of Municipal Sewage Effluent and Sludge on Forest and Disturbed Land. University Park [etc.]: Pennsylvania State University Press, 1979.

Cita MLA (9a ed.)

Sopper, William E., y Sonja N. Kerr. Utilization of Municipal Sewage Effluent and Sludge on Forest and Disturbed Land. Pennsylvania State University Press, 1979.