Fray Bernardino de Sahagún, Primeros Memoriales, ed. Thelma D. Sullivan (Norman: University of Oklahoma Press, 1997), 126.
Orthographic Variants:
youallapializtli, ioallapializtli
Alonso de Molina:
youallapializtli. ronda, el acto de rondar. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 41v. col. 1. Thanks to Joe Campbell for providing the transcription.