Sources

Wein, Elizabeth. Review of Hex Signs: Pennsylvania Dutch Barn Symbols and Their Meaning. Journal of American Folklore 114, no. 454 (2001): 512-513. doi:10.1353/jaf.2001.0045.

Tuel, Brenna.Symbols of Blood and Soil: Identity Construction and the Hex Signs of the Pennsylvania Germans. Concordia University (2019)

Yoder, Don; Best, Martha S.; Bomberger, Barbara B.; Breininger, Lester; Angstadt, Ernest; Gougler, Richard C.; DeLong, Marsha;
Longstreet, Dorothy L.; Zecher, Peg; Robacker, Earl F.; and Robacker, Ada, "Pennsylvania Folklife Vol. 23, Folk Festival Supplement"
(1974). Pennsylvania Folklife Magazine. 60.

https://digitalcommons.ursinus.edu/pafolklifemag/60

Graves, Thomas Edmund. THE PENNSYLVANIA GERMAN HEX SIGN: A STUDY IN FOLK PROCESS (FOLK ART, BELIEF, VERNACULAR ARCHITECTURE).University of Pennsylvania. ProQuest Dissertations Publishing, 1984. 8422908.

Clark, Kenneth W. Pennsylvania Hex Signs. Western Folklore Vol 22, No. 1 (Jan. 1963): 47 https://doi-org.ezproxy.proxy.library.oregonstate.edu/10.2307/1496737

Sims, Martha, and Stephens, Martine. 2011. Living Folklore, 2nd Edition : An Introduction to the Study of People and Their Traditions. Logan: Utah State University Press. Accessed August 11, 2021. ProQuest Ebook Central.