APA (7th ed.) Citation

LDS and Associates & Sikorski, L. D. (1988). Mastering American English cassette series. Sikorski.

Chicago Style (17th ed.) Citation

LDS and Associates and Lorna D. Sikorski. Mastering American English Cassette Series. Santa Ana, CA: Sikorski, 1988.

MLA (9th ed.) Citation

LDS and Associates and Lorna D. Sikorski. Mastering American English Cassette Series. Sikorski, 1988.

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