Gaya APA

Essentials of services marketing / Jochen Wirtz ; Christopher H. Lovelock. (2017). Harlow, Essex: Pearson Education, c.

Gaya MLA

Essentials of services marketing / Jochen Wirtz ; Christopher H. Lovelock. 3rd ed.. Harlow, Essex: Pearson Education, c, 2017. Buku Wajib.