APA Citation

Gradner, R. (1991). Investigate and discover: Forces and machines. Englewood Cliffs: Jullian Messner.

Chicago Style Citation

Gradner, Robert. Investigate and Discover: Forces and Machines. Englewood Cliffs: Jullian Messner, 1991.

MLA Citation

Gradner, Robert. Investigate and Discover: Forces and Machines. Englewood Cliffs: Jullian Messner, 1991.

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