Cita APA (7a ed.)
Watkins, R. K. (1938). I. SOME PROBLEMS INVOLVED IN A PROPOSED TWELVE-YEAR SCIENCE PROGRAM FOR THE PUBLIC SCHOOLS. Science Education, 22(2), 51-56.
Cita Chicago Style (17a ed.)
Watkins, Ralph K. "I. SOME PROBLEMS INVOLVED IN A PROPOSED TWELVE-YEAR SCIENCE PROGRAM FOR THE PUBLIC SCHOOLS." Science Education 22, no. 2 (1938): 51-56.
Cita MLA (9a ed.)
Watkins, Ralph K. "I. SOME PROBLEMS INVOLVED IN A PROPOSED TWELVE-YEAR SCIENCE PROGRAM FOR THE PUBLIC SCHOOLS." Science Education, vol. 22, no. 2, 1938, pp. 51-56.
Precaución: Estas citas no son 100% exactas.