Gaya APA

Putra, I, B, W., Anna, . (2017). Hukum kontrak internasional ( the law of international contract ) (Cet. 1). : Refika Aditama.

Gaya MLA

Putra, Ida, Bagus, Wyasa., Anna, . "Hukum kontrak internasional ( the law of international contract )". Cet. 1 : Refika Aditama, 2017. Textbook.