توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Lubell, H. (1991). The informal sector in the 1980s and 1990s. Development Centre of the Organisation for Economic Co-operation and Development ; OECD Publications and Information Centre, distributor].

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Lubell, Harold. The Informal Sector in the 1980s and 1990s. Paris : [Washington, D.C.: Development Centre of the Organisation for Economic Co-operation and Development ; OECD Publications and Information Centre, distributor], 1991.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

Lubell, Harold. The Informal Sector in the 1980s and 1990s. Development Centre of the Organisation for Economic Co-operation and Development ; OECD Publications and Information Centre, distributor], 1991.