Van Wyk, H. (1997). Painting flowers: The Van Wyk way. Art Instruction Associates.
Citazione stile Chigago Style (17a edizione)Van Wyk, Helen. Painting Flowers: The Van Wyk Way. Rockport, Mass: Art Instruction Associates, 1997.
Citatione MLA (9a ed.)Van Wyk, Helen. Painting Flowers: The Van Wyk Way. Art Instruction Associates, 1997.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.