Gaya APA

Guptill, A, L. (1967). Watercolor Painting Step By Step (Pertama, Cet 2). New York: Watson-Guptill Publications.

Gaya MLA

Guptill, Arthur, L. "Watercolor Painting Step By Step". Pertama, Cet 2 New York: Watson-Guptill Publications, 1967. Text.