APA
(1980). Developing Instructional Materials For Productive Skills. Bangkok: UNESCO Regional Office for Education in Asia and Oceania.
Chicago
1980. Developing Instructional Materials For Productive Skills. Bangkok: UNESCO Regional Office for Education in Asia and Oceania.
Harvard
(1980). Developing Instructional Materials For Productive Skills. Bangkok: UNESCO Regional Office for Education in Asia and Oceania.
MLA
Developing Instructional Materials For Productive Skills. Bangkok: UNESCO Regional Office for Education in Asia and Oceania. 1980.