APA (7th ed.) Citation

Sheffield, L., & Sheffield, N. (1929). Swimming simplified / by L. Sheffield and N. Sheffield. Library Press.

Chicago Style (17th ed.) Citation

Sheffield, L., and N. Sheffield. Swimming Simplified / by L. Sheffield and N. Sheffield. Library Press, 1929.

MLA (9th ed.) Citation

Sheffield, L., and N. Sheffield. Swimming Simplified / by L. Sheffield and N. Sheffield. Library Press, 1929.

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