American Sign Language, also known as ASL or Ameslan, is a language in visual-spatial modality. It is dominantly used by culturally Deaf people in the U.S. and speaking-English Canada. ASL is the 3rd or 4th most used language in the U.S.
Baker-Shenk, Charlotte; Cokely, Dennis (1991). American Sign Language: A Teacher's Resource Text on Grammar and Culture. Gallaudet University Press.
Sherman Wilcox & Phyllis Wilcox. Learning to See: American Sign Language as a Second Language.
Browse ASL Dictionary online.