@book{Knapp, author = {Knapp, Gerhard P.}, title = {Erich Fromm (K{\"o}pfe des XX. Jahrhunderts, Vol. 97), Berlin 1982, 95 pp. (Colloquium Verlag).}, language = {de} } @book{Knapp, author = {Knapp, Gerhard P.}, title = {The Art of Living. Erich Fromm's Life and Works (= American University Studies, Series VIII: Psychology, Vol. 13), New York etc. (Peter Lang) 1989, 270 p.}, language = {en} } @book{Knapp, author = {Knapp, Gerhard P.}, title = {The Art of Living. Erich Fromm's Life and Works (Japanese), Tokyo (Shin-hyoron) 1994.}, language = {ja} }