Gaya APA

Lau, L, G, A, B, M, D, J, Y. (2005). Logic: Key Concepts in Philosophy . : Continuum.

Gaya MLA

Lau, Laurence, Goldstein;, Andrew, Brennan;, Max, Deutsch;, Joe, Y.F.. "Logic: Key Concepts in Philosophy". : Continuum, 2005. Text.