cf. Welz, Stephan. (1989) Art at Auction in South Africa: Twenty Years of Sotheby's/Stephan Welz & Co, 1969-1989, Johannesburg: AD Donker (Pty) Ltd. a similar example illustrated in colour on page 121.
cf. Alexander, FL. (1962) Art in SouAh Africa: Painting, Sculpture and Graphic Work Since 1900, Cape Town: AA Balkema. A similar example illustrated on page 94, fig. 66.
Francois Petrus (Toon) van den Heever; gift to the current owner, Leonora van den Heever
Marais, Dalene. (1994) Maggie Laubser: her paintings, drawings and graphics, Johannesburg and Cape Town: Perskor. Illustrated on page 146, catalogue number 315; illustrated on page 211, catalogue number 690, with the title Portrait of an Old Man with Hat.
Van Rooyen, Johan. (1974) Maggie Laubser, Cape Town and Johannesburg: C Struik Publishers. Page 17:
'Oortmanspoort (the family farm) provided Maggie with models. Old Booi, a centenarian Bushman shepherd and family retainer, became a regular subject of whom portraits were repeated from memory even in later years.'