This article in the Catholic Encyclopedia presents the necessity, the nature, the origin/cause, the number, the effects, the minister, and the recipient of the Sacraments.
Article by John Hardon, S.J., focuses on understanding the Sacraments. They are listed and briefly defined, then the responsibilities of believers are described in relation to our time.
A Pastoral letter of Bishop John V. Daily of Brooklyn, New York, instructs on how the Sacrament of Penance leads to the Eucharist and brings one to the purification of souls.
Legislation on the disposition and conditions for reception of the seven Sacraments of the Catholic Church, as found in book 4 of the Code of Canon Law. Also includes sacramentals.
David J. Leigh, SJ, applies a modern theology approach to the Sacraments, bringing each one in turn under the light of modern cultural and social symbolism.