1. Perspective d'un developpement rural durable: Le cas des Hmongs du Laos Author(s): Bouapao, Lytou Format: Thesis Publisher: Ann Arbor : Universite de Sherbrooke (Canada), 1994.
2. History of the opium and this uses among the Hmong in South-East Asia Author(s): Culas, Christian Format: Journal article Citation: Journal Asiatique, Volume 287, Issue 2 (1999). pp. 629-677.