McAuliffe, Garrett (2008). Culturally Alert Counseling: A Comprehensive Introduction(en inglés). SAGE Publishing. p. 532. ISBN978-1-4129-1006-4. «About one-third of the world's population is considered Christian and can be divided into three main branches: (1) Roman Catholicism (the largest coherent group, representing over one billion baptized members); (2) Orthodox Christianity (including Eastern Orthodoxy and Oriental Orthodoxy); and (3) Protestantism (comprising many denominations and schools of thought, including Anglicanism, Reformed, Presbyterianism, Lutheranism, Methodism, Evangelicalism, and Pentecostalism).»
