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A readable paper on the history of thinking about sex ratios is:

Modern disucssions of sex ratios will involve inclusive fitness theory which we will talk about in week 4. The original papers on inclusive fitness theory are from W.D. Hamilton (and Maynard Smith taking the idea from Hamilton):

In the above papers, Hamilton gives the basic reasoning behind claims like the fact that (relative to the baseline of the average members of the population) full sisters in haplodiploid species have a relatedness coefficient of 3/4 instead of 1/2 as in diploid species (like us). But as far as I can tell, Hamilton doesn't connect this to sex ratios at all. His 1967 piece is a survey of a number of different reasons that the sex ratio might not be 1:1 and haplodiploidy is among them.

At a quick glance, I don't actually see an argument that the sex ratio for haplodiploids has an equilibrium of 3:1, but I bet it does follow from something in that paper. There is a popular and very readable discussion of inclusive fitness theory and sex ratio theory in Richard Dawkins' The Selfish Gene. There, Dawkins attributes the idea to Hamilton, but cites Trivers and Hare as showing that the sex ratio in haplodiploids is and should be 3:1.