A passionate friendship :
Clara Schumann and Brahms /
Marguerite and Jean Alley ; translated by Mervyn Savill.

APA Citation

Schumann, C., Brahms, J., Savill, M., Alley, J., Alley, M. (1956). A passionate friendship: Clara Schumann and Brahms. London, England: Staples Press.

MLA Citation

Alley, M, et al.. A Passionate Friendship: Clara Schumann And Brahms. London, England: Staples Press, 1956.

Warning: These citations may not always be complete (especially for serials).