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2. Lourenço P. Earth construction: natural materials as a contribute to construction sustainability (Construções em terra: os materiais naturais com contributo à sustentabilidade na construção). Master thesis in construction. Technical University of Lisbon; 2002 [in Portuguese].
3. Engineering design of earth buildings;NZ 4297,1998
4. New Mexico Earthen Building Materials Code 14.7.4. Santa Fé (NM): Construction Industries Division (CID) of the Regulation and Licensing Department; 2006.
5. The Australian earth building handbook. Sydney (Australia): Standards Australia; 2002.