Tohutoro APA (7th ed.)
Duggal, S. K. (2008). Buildig materials (3rd ed.). New Age International.
Tohutoru Kātū Chicago (17th ed.)
Duggal, S. K. Buildig Materials. 3rd ed. Kolkata: New Age International, 2008.
Tohutoro MLA (9th ed.)
Duggal, S. K. Buildig Materials. 3rd ed. New Age International, 2008.
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