APA (7th ed.) Citation

Kelly, H. C. (1944). A practical course in horology. The Manual arts press.

Chicago Style (17th ed.) Citation

Kelly, Harold Caleb. A Practical Course in Horology. Peoria, Ill.: The Manual arts press, 1944.

MLA (9th ed.) Citation

Kelly, Harold Caleb. A Practical Course in Horology. The Manual arts press, 1944.

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