- Gopal, D. and Bhatnagar, D.S. (1972). The effect of age at first calving and first lactation yield on lifetime production in Sahiwal cattle. Indian J. Dairy Sci. 25: 129-134.
- Murdia, C.K. and Tripathi, V.N. (1991). Effectiveness of different selection indices for genetic advancement in Jersey cattle. Indian J. Dairy Sci. 44(2): 162-166.
- Pundir, R.K. (1991). Genetic studies on the components of lifetime traits in Sahiwal and Hariana cattle. Ph.D. Thesis, Indian Veterinary Research Institute, Izatnagar, India.
- Singh, S.B.; Singh, S.P. and Desai, R.N. (1964). Effect of the age at first calving and first lactation milk production on longevity and life time milk production in Hariana cattle. Indian J. Vet. Sci. Anim. Husb. 34: 202-213.