Has much been written on psychodrama?

There are many books published in a number of languages since the 1920's. An extended bibliogrphy is available at Jim Sack's bibliography. There are numerous scientific journals published around the world in languages such as English, French, Gernam, Scandinavian, Dutch, Swedish, Spanish, Portuguese, Chines, Japanese and others as well as articles in a wide range of other journals. New books are published on various uses and aspects of psychodrama every year.