The Pew Forum on Religion and Public Life (2006). Spirit and Power: A 10-Country Survey of Pentecostalsபரணிடப்பட்டது 2010-10-19 at the வந்தவழி இயந்திரம். "While many renewalists say they attend religious services where speaking in tongues is a common practice, fewer tend to say that they themselves regularly speak or pray in tongues. In fact, in six of the 10 countries surveyed, more than four-in-ten pentecostals say they never speak or pray in tongues," page 16-17.
The Pew Forum on Religion and Public Life (2006). Spirit and Power: A 10-Country Survey of Pentecostalsபரணிடப்பட்டது 2010-10-19 at the வந்தவழி இயந்திரம். "While many renewalists say they attend religious services where speaking in tongues is a common practice, fewer tend to say that they themselves regularly speak or pray in tongues. In fact, in six of the 10 countries surveyed, more than four-in-ten pentecostals say they never speak or pray in tongues," page 16-17.