Nancy Folbre 
Who Pays for the Kids? [EPUB ebook] 
Gender and the Structures of Constraint

Three paradoxes surround the division of the costs of social reproduction:* Women have entered the paid labour force in growing numbers, but they continue to perform most of the unpaid labour of housework and childcare.* Birth rates have fallen but more and more mothers are supporting children on their own, with little or no assistance from fathers