APA aipamena

Case, D., & Doug Case. (1990). English puzzles: 50 puzzles and games for practising your English. Oxford: Heinemann.

Chicago Style aipamena

Case, Doug, và Doug Case. English Puzzles: 50 Puzzles and Games for Practising Your English. Oxford: Heinemann, 1990.

MLA aipamena

Case, Doug, và Doug Case. English Puzzles: 50 Puzzles and Games for Practising Your English. Oxford: Heinemann, 1990.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.