A 1967 homily by the founder of Opus Dei that encapsulates his teachings, taken from "Conversations with Josemaría Escriva," Scepter, 2002.
Every day the faithful of the prelature raise their hearts to God through this set of prayers in which they praise, thank and petition God the Father, through Jesus Christ in the Holy Spirit, for their own needs and those of others.
The statutes defining Opus Dei’s mission and structure, published (in Latin) in "The Canonical Path of Opus Dei," A. de Fuenmayor, V. Gomez-Iglesias, J. Illanes, Midwest Theological Forum, 1994.
Saint John Paul II erected Opus Dei as a personal prelature on November 28, 1982. Here is an address he gave at a workshop on the Apostolic Letter “Novo Millennio Ineunte,” on March 17, 2001, in which he outlines his hopes for the prelature.
The English translation of the apostolic constitution, Ut sit, by which Opus Dei was established as the Catholic Church's first personal prelature.
Most of these books are available at Sinag-tala or Scepter Publishers (see links at the bottom of the page).