Vibal, Victor R. , Principles of tourism / Victor R. Vibal. - Mandaluyong City: Anvil Publishing, Inc. , 2010. - xiii, 118 pages : pictures, tables; 25 cm. - Tourism environment and development series . Includes glossary and bibliography. English ISBN: Subjects--Topical Terms: Tourism - principles. Dewey Class. No.: 338.4791 / V65