(1770s-1790s): Trekboers into the Eastern Cape

F A Venter - Die volledige Lande-reeks: Geknelde Land; Offerland; Gelofteland en Bedoelde Land

Die Trekboer in die Geskiedenis van die Kaapkolonie 1657-1842 (Ons Geskiedenis-Serie) by Dr. P. H. van der Merwe

The Farmerfield Mission - A Christian Community in South Africa, 1838 - 2008 - Fiona Vernal

The Migrant Farmer in the History of the Cape Colony, 1657 - 1842 - P.J. van der Merwe, translated - Roger B. Beck