References
^ Humphries, Tom L.; Padden, Carol A.; Hills, Robert; Lott, Peggy; Renner, Daniel W. (2015). Learning American Sign Language Levels I & II--Beginning & Intermediate, with DVD (Text & DVD Package), Pearson. BiggerBooks. ISBN 9780205453917 (revised Feb 2024)^ (2013). Learning American Sign Language Levels I & II--Beginning & Intermediate, with DVD (Text & DVD Package) ECampus. ISBN 9780205453917 (revised Mar 2023)
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