His two serious operas, heavily indebted to Massenet, were performed in Paris; his light opera and other stage works were far more popular across French-speaking Europe. In 1914, Doret returned to Switzerland and began studying local popular music and folk music traditions. He also wrote for Swiss newspapers and wrote a memoir, Temps et contretemps, published in 1942.
Jacques Tchamkerten: "Gustave Doret". In: Andreas Kotte (ed.): Theaterlexikon der Schweiz – Dictionnaire du théâtre en Suisse. Vol. 1, Chronos, Zürich 2005, ISBN3034007159, p. 478 (in French)(in German)
Andrea Della Corte and Guido M. Gatti: "Gustave Doret". In: Dizionario di musica, Torino, Paravia, 1956, p. 195 (in Italian)