Liebson, M. (2001). Direct stone sculpture: A guide to technique and creativity (Revised and expanded second edition.). Schiffer Publishing.
Lua i Stíl Chicago (17ú heag.)Liebson, Milt. Direct Stone Sculpture: A Guide to Technique and Creativity. Revised and expanded second edition. Atglen, PA: Schiffer Publishing, 2001.
Lua MLA (9ú heag.)Liebson, Milt. Direct Stone Sculpture: A Guide to Technique and Creativity. Revised and expanded second edition. Schiffer Publishing, 2001.
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