Citazione APA

Sprague, E., & Sprague, C. (1926). How to design greeting cards. Bridgman.

Stile di citazione Chicago

Sprague, Elizabeth, e Curtiss Sprague. How to Design Greeting Cards. Pelham, N.Y: Bridgman, 1926.

Citazione MLA

Sprague, Elizabeth, e Curtiss Sprague. How to Design Greeting Cards. Bridgman, 1926.