एपीए उद्धरण

Wirtz, J. (2018). Essentials of services marketing. Harlow, England: Pearson.

शिकागो स्टाइल उद्धरण

Wirtz, Jochen. Essentials of Services Marketing. Harlow, England: Pearson, 2018.

एमएलए उद्धरण

Wirtz, Jochen. Essentials of Services Marketing. Harlow, England: Pearson, 2018.