Ling, Samuel; et al. (19 September 2016). "University Physics". OpenStax. Retrieved 2 April 2018.
doi.org
Enns, T. (1950). "Review of University Physics by Francis Weston Sears and Mark W. Zemansky". Science. 111 (2886): 413–414. doi:10.1126/science.111.2886.413.c. p. 414
Enns, T. (1950). "Review of University Physics by Francis Weston Sears and Mark W. Zemansky". Science. 111 (2886): 413–414. doi:10.1126/science.111.2886.413.c. p. 414