Evans, William P., Lorie L. Sicafuse, and Eric Killian. 2009. “4-H Youth Worker Characteristics: Comparisons With Workers from Other Youth Serving Organizations”. Journal of Extension 47 (6). https://archives.joe.org/joe/2009december/rb4.php.
William P. Evans
Singletary, Loretta, Marilyn G. Smith, and William P. Evans. 2006. “Self-Perceived 4-H Leader Competencies and Their Relation to the Skills Youth Learn through 4-H Youth Development Programs”. Journal of Extension 44 (4). https://archives.joe.org/joe/2006august/rb2.php.