Nadeau, Jenifer, Emily McCabe  Alger, and Tom  Hoagland. 2007. ?Longitudinal study of the general knowledge of 4-H horse members?. Journal of Extension 45(5). https://archives.joe.org/joe/2007october/rb6.php

Nadeau, Jenifer, Emily McCabe  Alger, Tom  Hoagland, and Kelly  Chameroy. 2004. ?Use of a randomized, categorized exam to determine horse knowledge of 4-H horse show participants?. Journal of Extension 42(3). https://archives.joe.org/joe/2004june/rb5.php