Gupta, S. (2022). Digital Marketing (2nd.). McGraw Hill Education (India) Private Limited.
芝加哥风格引文Gupta, Seema. Digital Marketing. 2nd. Chennai: McGraw Hill Education (India) Private Limited, 2022.
MLA引文Gupta, Seema. Digital Marketing. 2nd. McGraw Hill Education (India) Private Limited, 2022.
警告：这些引文格式不一定是100％准确.