Gaya APA

WK., N., Haryono, P, B. (2016). How To Win Customer Through Customer Service With Heart (pertama). Yogyakarta: Persatuan Dokter Spesialis Kardiovaskuler Indonesia.

Gaya MLA

WK., Nikodemus., Haryono, PM., Budi. "How To Win Customer Through Customer Service With Heart". pertama Yogyakarta: Persatuan Dokter Spesialis Kardiovaskuler Indonesia, 2016. Text.