Cita APA (7th ed.)
Duggal, S. K. (2008). Buildig materials (3rd ed.). New Age International.
Cita Chicago (17th ed.)
Duggal, S. K. Buildig Materials. 3rd ed. Kolkata: New Age International, 2008.
Cita MLA (9th ed.)
Duggal, S. K. Buildig Materials. 3rd ed. New Age International, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.