nt, http://people.uncw.edu/ballardt/bio240_241_lecture%20notes/Study%20Guide%2027%20-%20DEVELOPMENT.doc, ප්‍රතිෂ්ඨාපනය 2004-08-09 ↑  Chapter 46 Animal Reproduction, http://www.cbu.edu/~esalgado/BIOL112/Campbell/ch46.doc, ප්‍රතිෂ්ඨාපනය 2006-03-03 ↑ "In most Western countries the family model of a sole male breadwinner is in full retreat." Accessed 19 September 2007.↑ Why Are Fathers Important? සංරක්ෂණය කළ පිටපත 2008-02-25 at the Wayback Machine Interview with Dr. Ross Parke, professor of psychology at the University of California at Riverside, author of Fatherhood (1966) and co-author of Throwaway Dads (1999). Accessed 19 September 2007.↑ Save the Children, State of the World's Mothers Report 2006 සංරක්ෂණය කළ පිටපත 2015-05-01 at the Wayback Machine.↑ Gendered differences in parents' encouragement of sibling interaction: implications for the construction of a personal premise system↑ 9.0 9.1 Fathers' speech to their children: perfect pitch or tin ear?↑ Hladik, E., & Edwards