APA
Helperin W. (. B. E. L. (. &. M. R. R. (. E., . (1992). Public health surveillance. Van Nostrand Reinhold, New York: .
Chicago
Helperin William (ed) Baker Edward L (ed) & Monson Richard R (Consulting Ed), . 1992. Public health surveillance. Van Nostrand Reinhold, New York: .
Harvard
Helperin W. (. B. E. L. (. &. M. R. R. (. E., . (1992). Public health surveillance. Van Nostrand Reinhold, New York: .
MLA
Helperin William (ed) Baker Edward L (ed) & Monson Richard R (Consulting Ed), . Public health surveillance. Van Nostrand Reinhold, New York: . 1992.