APA (7th ed.) Citation

GREENALL, S., & SPRENGER, J. G. (1987). Horizons: : First Certificate. Heinemann Educational Books.

Chicago Style (17th ed.) Citation

GREENALL, Simon, and Judy Garton SPRENGER. Horizons: : First Certificate. London: Heinemann Educational Books, 1987.

MLA (9th ed.) Citation

GREENALL, Simon, and Judy Garton SPRENGER. Horizons: : First Certificate. Heinemann Educational Books, 1987.

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