Cita APA (7a ed.)
Hill, R. K., & Guzdial, M. (2019). Pondering Variables and Direct Instruction. Communications of the ACM, 62(4), 6-8.
Cita Chicago Style (17a ed.)
Hill, Robin K., y Mark Guzdial. "Pondering Variables and Direct Instruction." Communications of the ACM 62, no. 4 (2019): 6-8.
Cita MLA (9a ed.)
Hill, Robin K., y Mark Guzdial. "Pondering Variables and Direct Instruction." Communications of the ACM, vol. 62, no. 4, 2019, pp. 6-8.
Precaución: Estas citas no son 100% exactas.