"4-H Detailed History". College of Agriculture and Life Sciences, University of Arizona. Archived from the original on 19 June 2010. Retrieved 7 June 2010.
Radhakrishna, Rama B.; Sinasky, Megan (December 2005). "4-H Experiences Contributing to Leadership and Personal Development of 4-H Alumni". The Journal of Extension. 43 (6). Retrieved 28 March 2012.; of 1,254 members in Penn State alumni database, 289 were sampled for a survey and 168 provided useful data; 99% of these said they received some benefit from their participation
"4-H Detailed History". College of Agriculture and Life Sciences, University of Arizona. Archived from the original on 19 June 2010. Retrieved 7 June 2010.