The questions and answers of the Baltimore Catechism give a definition of Extreme Unction in numbers 956-977 and Holy Orders in numbers 978-1004, elaborating on each of them in turn.

A catechism-like question and answer on Holy Orders, in The Catholic FAQ, based on Holy Scriptures and related Church teaching.

The Catholic Encyclopedia, 1908, presents a brief yet thorough examination of this Sacrament.

In articles and questions format is shown how the ordained priest does his work by bringing the Sacraments to the faithful.

Encyclical promulgated in 1935 by Pope Pius XI on Catholic Priesthood who are "ordained for men in the things that appertain to God."

The priesthood is reviewed from the pagan, Jewish and Christian perspective. The author shows the molding of society by devoted Catholic priests throughout history.

Holy orders turn an ordinary man into a Priest, a prophet a King and a teacher. Also answers 6 frequently asked questions.

The full teaching of the Catholic Church on the Eucharist, from the Catechism of the Catholic Church, articles 1533-1600.