Smith, Marie F.; Leighton, Christine S. (Christina Stephanie); Morey, Liesl; Schonfeldt, H.C. (Hettie Carina)(South African Society of Crop Production/ Soil Science Society of South Africa/ South African Weed Science Society/ South African Society for Horticultural Sciences, 2009-01)
Van Heerden, Ingrid V.; Muller, Carmen; Schonfeldt, H.C. (Hettie Carina)(NISC (Pty) Ltd and Informa UK Limited (trading as the Taylor & Francis Group), 2023-09-16)