100 commonly asked questions in math class answers that promote mathematical understanding, grades 6-12 অনুযায়ী Posamentier, Alfred S., Farber, William, Germain-Williams, Terri L., Paris, Elaine, Thaller, Bernd, Lehmann, Ingmar

Business letters simplified and self-taught অনুযায়ী Farber, William M.

Business letters simplified and self-taught অনুযায়ী Farber, William M.

Business letters, simplified and self-taught অনুযায়ী Farber, William M.