Cita APA

Gray, O. S., & Gray, O. S. (1973). Cases and materials on enviromental law (2. edition.). Washington, D.C.: Bureau of National Affairs.

Citación estilo Chicago

Gray, Oscar S., y Oscar S. Gray. Cases and Materials On Enviromental Law. 2. edition. Washington, D.C.: Bureau of National Affairs, 1973.

Cita MLA

Gray, Oscar S., y Oscar S. Gray. Cases and Materials On Enviromental Law. 2. edition. Washington, D.C.: Bureau of National Affairs, 1973.