PRASADA RAO, N. D. V. (2016). THE GRAMMAR GATE - BOOK 4. BLACKIE ELT BOOKS.
芝加哥风格引文PRASADA RAO, N D V. THE GRAMMAR GATE - BOOK 4. NEW DELHI: BLACKIE ELT BOOKS, 2016.
MLA引文PRASADA RAO, N D V. THE GRAMMAR GATE - BOOK 4. BLACKIE ELT BOOKS, 2016.
警告：这些引文格式不一定是100％准确.