एपीए उद्धरण

Balakrishna Pillai. (1987). Road apakatangalum nivarana marganagalum. NBS.

शिकागो स्टाइल उद्धरण

Balakrishna Pillai. Road Apakatangalum Nivarana Marganagalum. Kottayam: NBS, 1987.

एमएलए उद्धरण

Balakrishna Pillai. Road Apakatangalum Nivarana Marganagalum. NBS, 1987.