Cita APA (7a ed.)

Kingsbury, R., & Wellman, G. (1986). Longman proficiency practice exams. Longman.

Cita Chicago Style (17a ed.)

Kingsbury, Roy, y Guy Wellman. Longman Proficiency Practice Exams. Harlow: Longman, 1986.

Cita MLA (9a ed.)

Kingsbury, Roy, y Guy Wellman. Longman Proficiency Practice Exams. Longman, 1986.