APA (7th ed.) Citation
LEWIS, S., & RICHARDS, S. (1993). THE EARLY STAGES OF LANGUAGE DEVELOPMENT: A NATURAL AURAL APPROACH.
Chicago Style (17th ed.) Citation
LEWIS, S., and S. RICHARDS. THE EARLY STAGES OF LANGUAGE DEVELOPMENT: A NATURAL AURAL APPROACH. 1993.
MLA (9th ed.) Citation
LEWIS, S., and S. RICHARDS. THE EARLY STAGES OF LANGUAGE DEVELOPMENT: A NATURAL AURAL APPROACH. 1993.
Warning: These citations may not always be 100% accurate.