TY  - RPRT
TI  - A consideration of childbirth programs.
AU  - W C BILLINGS
AU  - H THOMS
PY  - 1956
DO  - 10.1056/nejm195611012551806
UR  - https://pubmed.ncbi.nlm.nih.gov/13369729/
ID  - 13369729
ER  -