John F. Kippley has been active in the effort to uphold Humanae Vitae and provide practical help since it was published. In 1968 he wrote Covenant, Christ and Contraception published by Alba House in 1970. This has been revised and is now available from Ignatius as Sex and the Marriage Covenant: A Basis for Morality (2005). In 1969 his wife, Sheila, published her ground breaking book, Breastfeeding and Natural Child Spacing subsequently published by Harper and Row in 1974. In 1971 the Kippleys founded as organization to provide the practical help of systematic natural family planning and Ecological Breastfeeding plus doctrinal support with the covenant theology of the marriage act. They continue that work in Natural Family Planning International.