Conservancy in Rural Areas,by GEORGE MACDONALD,M.D.,D.P.H.,D.T.M.,Assistant Director,Ross Institute of Tropical Hygiene,London School of Hygiene and Tropical Medicine

Caldwell, Elfreda L. , and Parr, L.W. (1937). Journal of Infectious Diseases, Vol. LXI, pp. 148-183.

Carter, J.C. (1938). Bulletin of Hygiene, Vol. XIII, No. 8, pp. 591-599.

Greenwood, Major. (1932). Epidemiology, Historical and Experimental. The Oxford University Press.

Macdonald, G. (1939). The Indian Journal of Medical Research, Vol. XXVI, No. 4, pp. 1001-1040.

Yeager, Clark H. (1929). Malayan Medical journal, Vol. IV, No. 4, pp. 118-125.

Idem. (1931). Philippine Journal of Science, Vol. XLVI, No. 4, pp. 681-749.