SCHLEINITZ, O. V., & Watts, G. F. (1904). GEORGE FREDERICK WATTS. VELHAGEN & KLASING.
Lua i Stíl Chicago (17ú heag.)SCHLEINITZ, OTTO VON, agus George Frederick Watts. GEORGE FREDERICK WATTS. BIELEFELD & LEIPZIG: VELHAGEN & KLASING, 1904.
Lua MLA (8ú heag.)SCHLEINITZ, OTTO VON, agus George Frederick Watts. GEORGE FREDERICK WATTS. VELHAGEN & KLASING, 1904.
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