Citazione Stile APA (7a Edizione)

Gatchalian, J. C., & Gatchalian, M. M. (1987). The nature, consequences and prospects of underground employment in the four major cities of Metro Manila. s.n.].

Citazione stile Chigago Style (17a edizione)

Gatchalian, Jose C., e Miflora M. Gatchalian. The Nature, Consequences and Prospects of Underground Employment in the Four Major Cities of Metro Manila. [Quezon City: s.n.], 1987.

Citatione MLA (9a ed.)

Gatchalian, Jose C., e Miflora M. Gatchalian. The Nature, Consequences and Prospects of Underground Employment in the Four Major Cities of Metro Manila. s.n.], 1987.