Cita APA (7th ed.)
Anderson, J. K., & Coffin, H. G. (1977). Fossils in focus. Zondervan Pub. House.
Cita Chicago (17th ed.)
Anderson, J. Kerby, i Harold G. Coffin. Fossils in Focus. Grand Rapids: Zondervan Pub. House, 1977.
Cita MLA (9th ed.)
Anderson, J. Kerby, i Harold G. Coffin. Fossils in Focus. Zondervan Pub. House, 1977.
Atenció: Aquestes cites poden no estar 100% correctes.