Klausen, E.; Passman, R. H. Pretend companions (imaginary playmates): The emergence of a field. The Journal of Genetic Psychology. 2007, 167 (4): 349–364. PMID 17645227. doi:10.3200/gntp.167.4.349-364.
Klausen, E.; Passman, R. H. Pretend companions (imaginary playmates): The emergence of a field. The Journal of Genetic Psychology. 2007, 167 (4): 349–364. PMID 17645227. doi:10.3200/gntp.167.4.349-364.