Cita APA (7th ed.)

Methold, K., & Methold, C. (1978). Puzzles for english practice: PEP 1. Longman.

Cita Chicago (17th ed.)

Methold, Kenneth, i Chuntana Methold. Puzzles for English Practice: PEP 1. Londres: Longman, 1978.

Cita MLA (9th ed.)

Methold, Kenneth, i Chuntana Methold. Puzzles for English Practice: PEP 1. Longman, 1978.