Gaya APA

Langer, W, L. (1951). The Diplomacy of Imperialism (1890-1902) (1). New York, USA: New York.Alfred A. Knoff.

Gaya MLA

Langer, William, L.. "The Diplomacy of Imperialism (1890-1902)". 1 New York, USA: New York.Alfred A. Knoff, 1951. Koleksi Elektronik.