higgins, M. (1987). intermediate grammar workbook 2. Longman.
Chicago Style (17th ed.) Citationhiggins, MUriel. Intermediate Grammar Workbook 2. Longman, 1987.
MLA引文higgins, MUriel. Intermediate Grammar Workbook 2. Longman, 1987.
警告：這些引文格式不一定是100％准確.