Dyfyniad APA

Johnson, L., & Powell, F. M. (2016). Environmental law. Cengage Learning.

Dyfyniad Arddull Chicago

Johnson, Lisa, and Frona M. Powell. Environmental Law. Boston, MA: Cengage Learning, 2016.

Dyfyniad MLA

Johnson, Lisa, and Frona M. Powell. Environmental Law. Cengage Learning, 2016.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.