Gaya APA

Parramon, J, M., Martin, G. (1998). Drawing In Pencil: basic techniques & exercises (Pertama, Cet.1). New York: Watson-Guptill Publications.

Gaya MLA

Parramon, Jose, M., Martin, Gabriel. "Drawing In Pencil: basic techniques & exercises". Pertama, Cet.1 New York: Watson-Guptill Publications, 1998. Text.