Muwatta Malik, Book 2, Hadith 40 (USC-MSA)

Yahya related to me from Malik from Hisham ibn Urwa that Abu Urwa ibn az-Zubayr used to take off his turban and wipe his head with water.

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، أَنَّ أَبَاهُ، عُرْوَةَ بْنَ الزُّبَيْرِ كَانَ يَنْزِعُ الْعِمَامَةَ وَيَمْسَحُ رَأْسَهُ بِالْمَاءِ ‏.‏

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also referenced under: Book 2, Hadith 70 (In-Book)