RT Book
T1 Twins and twin relations
A1 Koch, Helen L. 1895-1977
LA English
PP Chicago, Ill. u.a.
PB Univ. of Chicago Pr.
YR 1967
ED 2. print.
UL https://krimdok.uni-tuebingen.de/Record/1095016237
K1 Zwilling : Verhaltenspsychologie