Obee, B. (1998). Cambridge first certificate: Grammar and usage. Cambridge University Press.
Chicago Style (17th ed.) CitationObee, Bob. Cambridge First Certificate: Grammar and Usage. Cambridge: Cambridge University Press, 1998.
ציטוט MLAObee, Bob. Cambridge First Certificate: Grammar and Usage. Cambridge University Press, 1998.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.