Gaya APA

Rock, N. (1983). Geologi lembar Lubuksikaping, Sumatra = The geology of the Lubuksikaping Quadrangle, Sumatra . Bandung: Geological Research and Development Center.

Gaya MLA

Rock, N.M.S.. "Geologi lembar Lubuksikaping, Sumatra = The geology of the Lubuksikaping Quadrangle, Sumatra". Bandung: Geological Research and Development Center, 1983. Text.