APA

(1991). The informal sector in the 1980's and 1990's. Paris: OECD.

Chicago

1991. The informal sector in the 1980's and 1990's. Paris: OECD.

Harvard

(1991). The informal sector in the 1980's and 1990's. Paris: OECD.

MLA

The informal sector in the 1980's and 1990's. Paris: OECD. 1991.