APA

Smith H. L., . (1946). Geographical nomenclature in Siam. New York-US: Geografical record.

Chicago

Smith Helen L, . 1946. Geographical nomenclature in Siam. New York-US: Geografical record.

Harvard

Smith H. L., . (1946). Geographical nomenclature in Siam. New York-US: Geografical record.

MLA

Smith Helen L, . Geographical nomenclature in Siam. New York-US: Geografical record. 1946.