Roth, H. (1946). At pencil's point: An enjoyable and sure way to be a good draughtsman. Stephen Daye.
Cita Chicago Style (17a ed.)Roth, Harry. At Pencil's Point: An Enjoyable and Sure Way to Be a Good Draughtsman. New York: Stephen Daye, 1946.
Cita MLA (9a ed.)Roth, Harry. At Pencil's Point: An Enjoyable and Sure Way to Be a Good Draughtsman. Stephen Daye, 1946.
Precaución: Estas citas no son 100% exactas.