Gaya APA

Willingness to pay for conservation of natural resources in Santubong National Park. (2017). Surabaya: Fak. Ekonomi, Universitas Kristen Petra.

Gaya MLA

Willingness to pay for conservation of natural resources in Santubong National Park. . Surabaya: Fak. Ekonomi, Universitas Kristen Petra, 2017. Artikel.