Παραπομπή σε μορφή APA (7η εκδ.)

Siebörger, R. F. (1975). The recruitment and organization of African labor for the Kimberley Diamond Mines, 1871-1888.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Siebörger, Robert Frederick. The Recruitment and Organization of African Labor for the Kimberley Diamond Mines, 1871-1888. 1975.

Παραπομπή σε μορφή MLA (8th εκδ.)

Siebörger, Robert Frederick. The Recruitment and Organization of African Labor for the Kimberley Diamond Mines, 1871-1888. 1975.