APA (7th ed.) Citation

Sim, D. D., & Dvorkin-Laufer, B. (1984). Vocabulary development. Collins ELT.

Chicago Style (17th ed.) Citation

Sim, D. D., and B. Dvorkin-Laufer. Vocabulary Development. London: Collins ELT, 1984.

MLA (9th ed.) Citation

Sim, D. D., and B. Dvorkin-Laufer. Vocabulary Development. Collins ELT, 1984.

Warning: These citations may not always be 100% accurate.