Karl Bühler's "Functional Pleasure vs. Creative Pleasure"

I’m currently reading a book on child development and make-believe and it makes reference to Karl Bühler’s concept of “functional pleasure vs. creative pleasure”. Unfortunately the book I’m reading doesn’t provide a cite for where Bühler wrote about this topic. Can anyone who is familiar with Bühler’s work point me to a primary reference?

One bump to see if there’s anybody in the weekday crowd who might know.

Are there any child development experts on the boards … ?

There is a (probably incomplete) bibliography of Buhler’s works here: http://findarticles.com/p/articles/mi_qa3711/is_199407/ai_n8726847/pg_8/?tag=content;col1

You might have more luck in General Questions.