APA (7th ed.) Citation
Abdalla, E., Nasr, A., Khalafallah, A., & El Shafie, S. (1990). The influences of age on lactation length and milk yield in Kenana and Butana cows.
Chicago Style (17th ed.) Citation
Abdalla, E.A, A.M Nasr, A.M Khalafallah, and S.A El Shafie. The Influences of Age on Lactation Length and Milk Yield in Kenana and Butana Cows. 1990.
MLA (9th ed.) Citation
Abdalla, E.A, et al. The Influences of Age on Lactation Length and Milk Yield in Kenana and Butana Cows. 1990.
Warning: These citations may not always be 100% accurate.