ELDER, W. H. and D.H. RODGERS. "IMMOBILIZATION AND MARKING OF AFRICAN ELEPHANTS AND THE PREDICTION OF BODY WEIGHT FROM FOOT CIRCUMFERENCE" Mammalia, 38.1 (2009): 33-53. Retrieved 19 Jun. 2013, from doi:10.1515/mamm.1974.38.1.33

ELDER, W. & RODGERS, D. (2009). IMMOBILIZATION AND MARKING OF AFRICAN ELEPHANTS AND THE PREDICTION OF BODY WEIGHT FROM FOOT CIRCUMFERENCE. Mammalia, 38(1), pp. 1-154. Retrieved 19 Jun. 2013, from doi:10.1515/mamm.1974.38.1.33

ELDER, W. H. and D.H. RODGERS. 2009. IMMOBILIZATION AND MARKING OF AFRICAN ELEPHANTS AND THE PREDICTION OF BODY WEIGHT FROM FOOT CIRCUMFERENCE. Mammalia. 38(1): 1-154. Retrieved 19 Jun. 2013, from doi:10.1515/mamm.1974.38.1.33