APA (7th ed.) Citation

Orr, W. N., & Orr, E. L. (1981). Handbook of Oregon plant and animal fossils. W.N. Orr.

Chicago Style (17th ed.) Citation

Orr, William N., and Elizabeth L. Orr. Handbook of Oregon Plant and Animal Fossils. Eugene, Or.: W.N. Orr, 1981.

MLA (8th ed.) Citation

Orr, William N., and Elizabeth L. Orr. Handbook of Oregon Plant and Animal Fossils. W.N. Orr, 1981.

Warning: These citations may not always be 100% accurate.