Hungerford, T. W., & Thomas W. Hungerford. Contemporary trigonometry: A graphing approach. Belmont, CA: Thomson Brooks/Cole.

Hungerford, Thomas W., و Thomas W. Hungerford. Contemporary Trigonometry: A Graphing Approach. Belmont, CA: Thomson Brooks/Cole.

Hungerford, Thomas W., و Thomas W. Hungerford. Contemporary Trigonometry: A Graphing Approach. Belmont, CA: Thomson Brooks/Cole.