Citazione Stile APA (7a Edizione)

Somjin Plongkhun. (1977). The cost-benefit analysis of nonformal education. s.n.

Citazione stile Chigago Style (17a edizione)

Somjin Plongkhun. The Cost-benefit Analysis of Nonformal Education. s.l: s.n, 1977.

Citatione MLA (9a ed.)

Somjin Plongkhun. The Cost-benefit Analysis of Nonformal Education. s.n, 1977.