Allison, Elizabeth (2004) Spiritually Motivated Natural Ressource Protection in Eastern Bhutan. In: The Spider and the Piglet: Proceedings of the First Seminar on Bhutan Studies. Thimphu, Centre for Bhutan Studies 2004, pp. 529-563 . ISBN 99936-14-19-X
Caspari, Thomas (2004) Relevance of Soils for Gross National Happiness. In: Gross National Happiness and Development - Proceedings of the First International Conference on Operationalization of Gross National Happiness. Thimphu, Centre for Bhutan Studies 2004, pp. 692-705 . ISBN 99936-14-22-X