Bills, Rex E.. The Rulership Book. United States, American Federation of Astrologers, Incorporated, 2007.

Goldstein-Jacobson, Ivy Martha-Marie. Simplified Horary Astrology: With Requisite Mathematics. United States, Pasadena Lithographers, 1966.

Falconer, Kim. Astrology and Aptitude: How to Become What You Were Meant to Be. United States, American Federation of Astrologers, 2005.