Gaya APA

Willbourn, E. (1922). An Account of the Geology and Mining Industries of South Selagor and Negri Sembilan . : Geological Department Federated Malay States.

Gaya MLA

Willbourn, E.S.. "An Account of the Geology and Mining Industries of South Selagor and Negri Sembilan". : Geological Department Federated Malay States, 1922. Text.