Cita APA (7th ed.)

Popkorn, S. (1994). First steps in model logic. Cambridge Univ. Pr.

Cita Chicago (17th ed.)

Popkorn, Sally. First Steps in Model Logic. Cambridge: Cambridge Univ. Pr, 1994.

Cita MLA (9th ed.)

Popkorn, Sally. First Steps in Model Logic. Cambridge Univ. Pr, 1994.