Gupta Nikhil. (2023). Black Book of English Vocabulary. Gupta Edu Tech.
Chicago Style (17th ed.) CitationGupta Nikhil. Black Book of English Vocabulary. Gupta Edu Tech, 2023.
MLA引文Gupta Nikhil. Black Book of English Vocabulary. Gupta Edu Tech, 2023.
警告：這些引文格式不一定是100％准確.