Simpson, W. (1996). The Buddhist praying-wheel: The symbolism of the wheel and circular movements in custom and religious ritual. Aryan Books International.

Simpson, William. The Buddhist Praying-wheel: The Symbolism of the Wheel and Circular Movements in Custom and Religious Ritual. New Delhi: Aryan Books International, 1996.

Simpson, William. The Buddhist Praying-wheel: The Symbolism of the Wheel and Circular Movements in Custom and Religious Ritual. Aryan Books International, 1996.