APA (7th ed.) Citation

Harper, W. R. (1967). Contact and frictional electrification. Clarendon Pr.

Chicago Style (17th ed.) Citation

Harper, Wallace R. Contact and Frictional Electrification. Oxford: Clarendon Pr, 1967.

MLA (9th ed.) Citation

Harper, Wallace R. Contact and Frictional Electrification. Clarendon Pr, 1967.

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