Leffingwell, E. (2008). John Zinsser at James Graham & Sons. Art in America.
Chicago-Zitierstil (17. Ausg.)Leffingwell, Edward. "John Zinsser at James Graham & Sons." Art in America 2008.
MLA-Zitierstil (8. Ausg.)Leffingwell, Edward. "John Zinsser at James Graham & Sons." Art in America, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.