https://katalog.hfmdd.de/Record/ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMjMwNy8xMTI2NTM1 Schmuck, Richard:
Sex of Sibling, Birth Order Position, and Female Dispositions to Conform in Two-Child Families. 1963. — 913.