Bureau of Labor Statistics, US Department of Labor: New Release 87-345. Washington, DC: DOL, August, 1987.
2.
US Bureau of the Census: Current Population Reports, Series P-70, No. 9, Who's Minding the Kids? Child Care Arrangements: Winter 1984-85. Washington, DC: Govt Printing Office, 1987.
3.
Vries MW, de Vries MRCultural relativity of toilet training readiness: A perspective from East Africa. Pediatr1977;60:170-7.
4.
Berk LB, Friman PC 'Epidemiologic aspects of toilet training. Clin Pediatr1990;29:278-82.
