APA (7th ed.) Citation

de Castro, R., & Grossman, J. W. (1999). Famous trails to Paul Erdos. Mathematical Intelligencer, 21(3), 51. https://doi.org/10.1007/BF03025416

Chicago Style (17th ed.) Citation

de Castro, Rodrigo, and Jerrold W. Grossman. "Famous Trails to Paul Erdos." Mathematical Intelligencer 21, no. 3 (1999): 51. https://doi.org/10.1007/BF03025416.

MLA (9th ed.) Citation

de Castro, Rodrigo, and Jerrold W. Grossman. "Famous Trails to Paul Erdos." Mathematical Intelligencer, vol. 21, no. 3, 1999, p. 51, https://doi.org/10.1007/BF03025416.