Cita APA

Hrehorovich, V. R., Schrack, W. D., Hall, D. A., Longenecker, R. E., & Gratch, I. F. (1970). Influenza surveillance in Pennsylvania.

Chicago Style Citation

Hrehorovich, V. R., W. D. Schrack, D. A. Hall, R. E. Longenecker, i I. F. Gratch. Influenza Surveillance in Pennsylvania. 1970.

Cita MLA

Hrehorovich, V. R., et al. Influenza Surveillance in Pennsylvania. 1970.