I Seiffge-Krenke

The functions of pen pals for adolescents.

S Shulman, S. Shulman, I. Seiffge-Krenke, 1994, The Journal of psychology.

["Dear Kitty, you asked me...": imaginary companions and real friends in adolescence].

I Seiffge-Krenke, 2001, Praxis der Kinderpsychologie und Kinderpsychiatrie.