APA (7th ed.) Citation

APPEL, A. W., & FELTY, A. P. (2004). Polymorphic lemmas and definitions in $\lambda$Prolog and Twelf. Theory and practice of logic programming, 4(1-2), 1-39. https://doi.org/10.1017/S1471068403001698

Chicago Style (17th ed.) Citation

APPEL, ANDREW W., and AMY P. FELTY. "Polymorphic Lemmas and Definitions in $\lambda$Prolog and Twelf." Theory and Practice of Logic Programming 4, no. 1-2 (2004): 1-39. https://doi.org/10.1017/S1471068403001698.

MLA (9th ed.) Citation

APPEL, ANDREW W., and AMY P. FELTY. "Polymorphic Lemmas and Definitions in $\lambda$Prolog and Twelf." Theory and Practice of Logic Programming, vol. 4, no. 1-2, 2004, pp. 1-39, https://doi.org/10.1017/S1471068403001698.