Cita APA (7th ed.)

Villegas, E. M. Negative judgments [microform]. Photoduplication Service.

Cita Chicago (17th ed.)

Villegas, Edberto MAlvar. Negative Judgments [microform]. Quezon City: Photoduplication Service.

Cita MLA (9th ed.)

Villegas, Edberto MAlvar. Negative Judgments [microform]. Photoduplication Service.