GundlachR. H.Childhood parental relationships and the establishment of gender roles of homosexuals. Journal of Consulting and Clinical Psychology, 1969, 33, 136–139.
2.
GundlachR. H.Data on the relation of birth order and sex of siblings of lesbians oppose the hypothesis that homosexuality is genetic. Annals of the New York Academy of Sciences, 1972, 197, 179–182.
3.
GundlachR. H.Birth order among lesbians: New light on an only child. Psychological Reports, 1977, 40, 250.
4.
GundlachR. R.RiessB. F.Birth order and sex of siblings in a sample of lesbians and non-lesbians. Psychological Reports, 1967, 20, 61–62.