Παραπομπή APA

Crossley,J.N, & Crossley, J. N. (1972). What is mathematical logic? Dover Publications.

Παραπομπή Chicago Style

Crossley,J.N, και John N. Crossley. What Is Mathematical Logic? New York: Dover Publications, 1972.

Παραπομπή MLA

Crossley,J.N, και John N. Crossley. What Is Mathematical Logic? Dover Publications, 1972.