Gaya APA

HELSEN, K., KOTABE, M, (. (2017). International marketing (7th ed.). [s.l.]: John Wiley & Sons.

Gaya MLA

HELSEN, Kristiaan., KOTABE, Masaaki, (Mike). "International marketing". 7th ed. [s.l.]: John Wiley & Sons, 2017. Buku.