AMA 10th edition
In-text citation: (1), (2), (3), etc.
Reference: Wilhelmi MR, Godino JD, Lacasta E. Didactic Effectiveness of Mathematical Definitions: The Case of the Absolute Value. Int Elect J Math Ed. 2007;2(2), 72-90.
APA 6th edition
In-text citation: (Wilhelmi et al., 2007)
Reference: Wilhelmi, M. R., Godino, J. D., & Lacasta, E. (2007). Didactic Effectiveness of Mathematical Definitions: The Case of the Absolute Value. International Electronic Journal of Mathematics Education, 2(2), 72-90.
Chicago
In-text citation: (Wilhelmi et al., 2007)
Reference: Wilhelmi, Miguel R., Juan D. Godino, and Eduardo Lacasta. "Didactic Effectiveness of Mathematical Definitions: The Case of the Absolute Value". International Electronic Journal of Mathematics Education 2007 2 no. 2 (2007): 72-90.
Harvard
In-text citation: (Wilhelmi et al., 2007)
Reference: Wilhelmi, M. R., Godino, J. D., and Lacasta, E. (2007). Didactic Effectiveness of Mathematical Definitions: The Case of the Absolute Value. International Electronic Journal of Mathematics Education, 2(2), pp. 72-90.
MLA
In-text citation: (Wilhelmi et al., 2007)
Reference: Wilhelmi, Miguel R. et al. "Didactic Effectiveness of Mathematical Definitions: The Case of the Absolute Value". International Electronic Journal of Mathematics Education, vol. 2, no. 2, 2007, pp. 72-90.
Vancouver
In-text citation: (1), (2), (3), etc.
Reference: Wilhelmi MR, Godino JD, Lacasta E. Didactic Effectiveness of Mathematical Definitions: The Case of the Absolute Value. Int Elect J Math Ed. 2007;2(2):72-90.