Cita APA (7th ed.)
Duggal, S. (2018). Building materials (4th ed.). New Age International.
Cita Chicago (17th ed.)
Duggal, S.K. Building Materials. 4th ed. Kolkata: New Age International, 2018.
Cita MLA (9th ed.)
Duggal, S.K. Building Materials. 4th ed. New Age International, 2018.
Atenció: Aquestes cites poden no estar 100% correctes.