Gaya APA

ONG, J, O., SUPRAYOGI, . (2011). Vehicle routing problem with backhaul, multiple trips and time window . Surabaya: Univ. Kristen Petra Surabaya.

Gaya MLA

ONG, Johan, Oscar., SUPRAYOGI, . "Vehicle routing problem with backhaul, multiple trips and time window". Surabaya: Univ. Kristen Petra Surabaya, 2011. Artikel.