Autobiography of a Yogi has a chapter specifically about Kriya Yoga.
A kriya yogi, someone initiated into the technique, practices kriya daily in morning and night meditations. One correctly practiced kriya, as explained in the AY, takes about a half a minute and is the equivalent of one year of natural evolution. The liberating technique enables even the beginning devotee to have direct personal communion with God.
Kriya yoga is part of the Raja Yoga how-to-live system taught by Paramahansa Yogananda, who in 1920 founded Self-Realization Fellowship to spread the teaching worldwide and preserve their purity. Yogananda called kriya the airplane route to God. I would suggest browsing the SRF site for more information.
http://www.yogananda-srf.org/aboutsrf
