Green, J., Hilton, M., & Ling, M. (1985). Penguin speaking skills: Student's book. Penguin Books.
Chicago Style (17th ed.) CitationGreen, John, Mark Hilton, and Maggie Ling. Penguin Speaking Skills: Student's Book. Great Brittain: Penguin Books, 1985.
MLA (8th ed.) CitationGreen, John, et al. Penguin Speaking Skills: Student's Book. Penguin Books, 1985.
Warning: These citations may not always be 100% accurate.
