Formation : Saifur Rahman Al-Mubarakpuri
Source : http://www.islamhouse.com/p/51776
Formation : Abu Ameenah Bilal Philips
From issues : http://www.islambasics.com - Islam Basics Website
Source : http://www.islamhouse.com/p/51910
Source : http://www.islamhouse.com/p/283516
Formation : Saleh Ali Alsobiyl
Source : http://www.islamhouse.com/p/385678
Formation : Muhammad Salih Al-Munajjid
Source : http://www.islamhouse.com/p/1233