Constantine, M., & Jacobson, E. (1961). Sign language for buildings and landscape. New York: Reinhold.
Παραπομπή Chicago StyleConstantine, Mildred, and Egbert Jacobson. Sign Language for Buildings and Landscape. New York: Reinhold, 1961.
Παραπομπή MLAConstantine, Mildred, and Egbert Jacobson. Sign Language for Buildings and Landscape. New York: Reinhold, 1961.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.