Gaya APA

Hidatullah, D., Karmila, E. (2009). Exploitation of plantation labor in 19 th century America and Indonesia : a comparative analysis between sothern`s slave system and east umatra`s coolie system . Yogyakarta: Graduate School Gadjah Mada University.

Gaya MLA

Hidatullah, Danial., Karmila, Emil. "Exploitation of plantation labor in 19 th century America and Indonesia : a comparative analysis between sothern`s slave system and east umatra`s coolie system". Yogyakarta: Graduate School Gadjah Mada University, 2009. Text.