HEFFERNAN, J. B. (1992). A RURAL SOCIOLOGISTS PERSPECTIVE. In M. L. Myers, R. F. Herrick, S. A. Olenchock, J. R. Myers, J. E. Parker, D. L. Hard, & K. Wilson (Eds.), SURGEON GENERAL’S CONFERENCE ON AGRICULTURAL SAFETY AND HEALTH (pp. 419–431). DES MOINES, IA: US DEPT COMMERCE NATL TECH INFORMATION SERVICE.

HEFFERNAN, J. B. “A RURAL SOCIOLOGISTS PERSPECTIVE.” In SURGEON GENERAL’S CONFERENCE ON AGRICULTURAL SAFETY AND HEALTH, edited by M. L. Myers, R. F. Herrick, S. A. Olenchock, J. R. Myers, J. E. Parker, D. L. Hard, and K. Wilson, 419–31. US DEPT COMMERCE NATL TECH INFORMATION SERVICE, 1992.

HEFFERNAN JB. A RURAL SOCIOLOGISTS PERSPECTIVE. In: Myers ML, Herrick RF, Olenchock SA, Myers JR, Parker JE, Hard DL, et al., editors. SURGEON GENERAL’S CONFERENCE ON AGRICULTURAL SAFETY AND HEALTH. US DEPT COMMERCE NATL TECH INFORMATION SERVICE; 1992. p. 419–31.

HEFFERNAN, J. B. “A RURAL SOCIOLOGISTS PERSPECTIVE.” SURGEON GENERAL’S CONFERENCE ON AGRICULTURAL SAFETY AND HEALTH, edited by M. L. Myers et al., US DEPT COMMERCE NATL TECH INFORMATION SERVICE, 1992, pp. 419–31.

HEFFERNAN JB. A RURAL SOCIOLOGISTS PERSPECTIVE. In: Myers ML, Herrick RF, Olenchock SA, Myers JR, Parker JE, Hard DL, Wilson K, editors. SURGEON GENERAL’S CONFERENCE ON AGRICULTURAL SAFETY AND HEALTH. US DEPT COMMERCE NATL TECH INFORMATION SERVICE; 1992. p. 419–431.