APA-referens (7:e uppl.)
Sherwood, W., Seckler, B., & Stewart, F. Paintings on Stamps: An Encyclopedic Handbook Arranged by Artist and Covering all Paintings, Drawings, Watercolors, Lithographs, Sketches, Engravings, Etchings, and Similar Works on Postage Stamps.
Chicago-referens (17:e uppl.)
Sherwood, William, Bernard Seckler, och Francine Stewart. Paintings on Stamps: An Encyclopedic Handbook Arranged by Artist and Covering All Paintings, Drawings, Watercolors, Lithographs, Sketches, Engravings, Etchings, and Similar Works on Postage Stamps.
MLA-referens (9:e uppl.)
Sherwood, William, et al. Paintings on Stamps: An Encyclopedic Handbook Arranged by Artist and Covering All Paintings, Drawings, Watercolors, Lithographs, Sketches, Engravings, Etchings, and Similar Works on Postage Stamps.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.