TY  - GEN
AU  - BILLINGS,John J
TI  - The Ovulation Method: natural Family Planning
SN  - 0 8146 1011 0
AV  - RG 136.5 .B54 
PY  - 0000///The Liturgical Press
CY  - Los Angeles
PB  - 1984
KW  - Natural family planning
KW  - Ovulation method
ER  -