Todd M. Johnson, Brian J. Grim: The World's Religions in Figures: An Introduction to International Religious Demography. Wiley-Blackwell, Hoboken, NJ 2013, S. 34. (pdf)
Todd M. Johnson, Brian J. Grim: The World's Religions in Figures: An Introduction to International Religious Demography. Wiley-Blackwell, Hoboken, NJ 2013, S. 35. Chapter 1 Global Religious Populations, 1910–2010
Hisao Inagaki, Harold Stewart (transl.): The Three Pure Land Sutras. Numata Center for Buddhist Translation and Research, Berkeley 2003, ISBN 1-886439-18-4PDF (Memento vom 21. Mai 2015 im Internet Archive)