Cita APA

Chung, W. B., Lin, M. W., Chang, W. F., Hsu, M., & Yang, P. C. (1997). Persistence of porcine reproductive and respiratory syndrome virus in intensive farrow-to-finish pig herds.

Chicago Style Citation

Chung, W B., M W. Lin, W F. Chang, M. Hsu, i P C. Yang. Persistence of Porcine Reproductive and Respiratory Syndrome Virus in Intensive Farrow-to-finish Pig Herds. 1997.

Cita MLA

Chung, W B., et al. Persistence of Porcine Reproductive and Respiratory Syndrome Virus in Intensive Farrow-to-finish Pig Herds. 1997.