APA (7th ed.) Citation

Humphreys, C. (1987). Concentration and meditation : a manual of mind development / by Christmas Humphreys: A manual of mind development. Element.

Chicago Style (17th ed.) Citation

Humphreys, Christmas. Concentration and Meditation : A Manual of Mind Development / by Christmas Humphreys: A Manual of Mind Development. Shaftesbury: Element, 1987.

MLA (9th ed.) Citation

Humphreys, Christmas. Concentration and Meditation : A Manual of Mind Development / by Christmas Humphreys: A Manual of Mind Development. Element, 1987.

Warning: These citations may not always be 100% accurate.