Gaya APA

Sugiyanto, G. et al (2010). Estimation of congestion cost of private passenger car users in Malioboro, Yogyakarta . Surabaya: Petra Christian University.

Gaya MLA

Sugiyanto, G.. et al. "Estimation of congestion cost of private passenger car users in Malioboro, Yogyakarta". Surabaya: Petra Christian University, 2010. Artikel.