Cita APA (7a ed.)

Gazdar, G., & Mellish, C. (1989). Natural language processing in Prolog. s.l.

Cita Chicago Style (17a ed.)

Gazdar, Gerald, y Chris Mellish. Natural Language Processing in Prolog. Addison-Wesley: s.l, 1989.

Cita MLA (8a ed.)

Gazdar, Gerald, y Chris Mellish. Natural Language Processing in Prolog. s.l, 1989.