APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

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