Richard to Minna Wagner.
Letters to his first wife.
Translated, prefaced, etc., by William Ashton Ellis.
Wagner, R., Ellis, W. Ashton., Wagner, M. Planer. (1909). Richard to Minna Wagner: Letters to his first wife. New York: C. Scribner's sons.
Wagner, Richard, 1813-1883, William Ashton Ellis, and Minna Planer Wagner. Richard to Minna Wagner: Letters to His First Wife. New York: C. Scribner's sons, 1909.
Warning: These citations may not always be complete (especially for serials).