Colledge, R. (1999). The mosque. In: Mastering World Religions. Macmillan Master Series. Palgrave, London. https://doi.org/10.1007/978-1-349-14329-0_16 "A mosque is a building where Muslims bow before Allah to show their submission to His will. It is not necessary to have a building to do this. Muhammad said that 'Wherever the hour of prayer overtakes you, you shall perform the prayer. That place is the mosque'. In his early days in Makkah there was no mosque, so he and his friends would pray anywhere."
