APA
Ted Themelis, . (1992). The heat treatment of ruby and sapphire. Gemlab, Florida: .
Chicago
Ted Themelis, . 1992. The heat treatment of ruby and sapphire. Gemlab, Florida: .
Harvard
Ted Themelis, . (1992). The heat treatment of ruby and sapphire. Gemlab, Florida: .
MLA
Ted Themelis, . The heat treatment of ruby and sapphire. Gemlab, Florida: . 1992.