"The World's Muslims: Unity and Diversity"(PDF). Pew Forum on Religious & Public life. August 9 2012. Diarsipkan dari versi asli(PDF) tanggal 2012-10-24. Diakses tanggal August 14 2012.Periksa nilai tanggal di: |accessdate=, |date= (bantuan)
researchgate.net
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"The World's Muslims: Unity and Diversity"(PDF). Pew Forum on Religious & Public life. August 9 2012. Diarsipkan dari versi asli(PDF) tanggal 2012-10-24. Diakses tanggal August 14 2012.Periksa nilai tanggal di: |accessdate=, |date= (bantuan)