This issue is mentioned in The Important Lessons For The Muslim Ummah by Sheikh Abdul Aziz bin Abdullaah bin Baz, translated by Khalid Al-Awadh and edited by Dr. Saleh As-Saleh, published by the Cooperative Office for Call and Guidance at Al-Badia, Riyadh, KSA 1993.
quote:
The Eleventh Lesson:
Invalidation of the prayers : Any prayer is invalid and nullified if any of the following acts are committed: 1) Intentional talking, 2) Laughing, 3) Eating, 4) Drinking, 5) Uncovering the parts of the body of which are not allowed to be uncovered during prayer, 6) Excessive alteration in the direction towards the Qibla. 7) Excessive moving outside the regular acts and movements of prayer, without a proper reason and 8) Nullifying the ablution.