Vogel, J., & Vogel, R. (2001). Conta and Boehme Porcelain: Identification and Value Guide.
Lua i Stíl Chicago (17ú heag.)Vogel, Janice, agus Richard Vogel. Conta and Boehme Porcelain: Identification and Value Guide. Ocala, 2001.
Lua MLA (8ú heag.)Vogel, Janice, agus Richard Vogel. Conta and Boehme Porcelain: Identification and Value Guide. 2001.
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