Gerdts, W. H. (1989). A Pleasant likeness: Portraits and landscapes of central New Jersey, 1770-1920 : an exhibition. [Princeton]: Squibb Corporation and the Historical Society of Princeton, New Jersey.

Gerdts, William H. A Pleasant Likeness: Portraits and Landscapes of Central New Jersey, 1770-1920 : An Exhibition. [Princeton]: Squibb Corporation and the Historical Society of Princeton, New Jersey, 1989.

Gerdts, William H. A Pleasant Likeness: Portraits and Landscapes of Central New Jersey, 1770-1920 : An Exhibition. [Princeton]: Squibb Corporation and the Historical Society of Princeton, New Jersey, 1989.