(1987). NATIONAL Institute year book 1989. : Gabumo Publishers.
Cita Chicago (17th ed.)NATIONAL Institute Year Book 1989. : Gabumo Publishers, 1987.
Cita MLA (9th ed.)NATIONAL Institute Year Book 1989. : Gabumo Publishers, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.