Six Reference BOOKS, "Otto Landsberg 1803-1905" by S.A de Villiers (1974), "Frederick I'ons, Artist" by J.J. Redgrave and E. Bradlow (1958), "Artworks of the Firstrand Banking Group" compiled by S. Bales and C. Kemp (2003), "Studio Encounters" by N. Lewis (1963), "The MacWhirter Sketch Book" introduction by E. Bale (1921), "Art at Auction in South Africa: The Art Market Review 1969 to 1995" by S. Welz (1996), please inspect.