* World Tops and Bottoms, by Grant Hutchison, 1996, TACit Press, ISBN 0-9522680-4-3, and subsequent research by the same author, in collaboration with field research by Ginge Fullen.
* World Tops and Bottoms, by Grant Hutchison, 1996, TACit Press, ISBN 0-9522680-4-3, and subsequent research by the same author, in collaboration with field research by Ginge Fullen.