Gaya APA

Giesen, W., Sukotjo, . (1991). The West Sumatran Lakes: Survey Report (Cet. 1.--). Bogor: AWB - Indonesia.

Gaya MLA

Giesen, Wim., Sukotjo, . "The West Sumatran Lakes: Survey Report". Cet. 1.-- Bogor: AWB - Indonesia, 1991. Text.