APA (7th ed.) Citation

Spencer, D. H., & Hornby, A. S. An intermediate English course for adult learners. Oxford Univ.Pr.

Chicago Style (17th ed.) Citation

Spencer, Duncan H., and Albert Sydney Hornby. An Intermediate English Course for Adult Learners. London: Oxford Univ.Pr.

MLA (9th ed.) Citation

Spencer, Duncan H., and Albert Sydney Hornby. An Intermediate English Course for Adult Learners. Oxford Univ.Pr.

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