Grab, S., & Knight, J. (2015). Landscapes and Landforms of South Africa: Features some of the most stunning landscapes portrayed through ca. 90 colour photographs. Springer.

Grab, Stefan, و Jasper Knight. Landscapes and Landforms of South Africa: Features Some of the Most Stunning Landscapes Portrayed Through Ca. 90 Colour Photographs. Springer, 2015.

Grab, Stefan, و Jasper Knight. Landscapes and Landforms of South Africa: Features Some of the Most Stunning Landscapes Portrayed Through Ca. 90 Colour Photographs. Springer, 2015.