Παραπομπή APA
Lieberman, J. N. (1977). Playfulness: Its relationship to imagination and creativity. New York: Academic Press.
Παραπομπή Chicago StyleLieberman, Josefa Nina. Playfulness: Its Relationship to Imagination and Creativity. New York: Academic Press, 1977.
Παραπομπή MLALieberman, Josefa Nina. Playfulness: Its Relationship to Imagination and Creativity. New York: Academic Press, 1977.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.