CARRABBA, Jr.; TALBERT, B. Allen; FIELD, William E.; TORMOEHLEN, Roger. Effectiveness Of The Indiana 4-H Tractor Program: Alumni Perceptions. Journal of Agricultural Education, [S. l.], v. 42, n. 3, p. 11–20, 2001. DOI: 10.5032/jae.2001.03011. Disponível em: https://jae-online.org/index.php/jae/article/view/1595. Acesso em: 21 feb. 2025.