Holmes, Jessica; Tiefenthaler, Jill (1997). "Cheaper by the dozen? The marginal time costs of children in the Philippines". Population Research and Policy Review. 16 (6): 561–578. doi:10.1023/A:1005756622764. ISSN1573-7829.
"Child Endowment". The Argus (Melbourne). No.25, 236. Victoria, Australia. 29 June 1927. p.20. Retrieved 3 February 2025– via National Library of Australia.
Holmes, Jessica; Tiefenthaler, Jill (1997). "Cheaper by the dozen? The marginal time costs of children in the Philippines". Population Research and Policy Review. 16 (6): 561–578. doi:10.1023/A:1005756622764. ISSN1573-7829.