एपीए उद्धरण

Chacko, P. E. (1972). Safety engineering (Rev. ed.). Rose Chacko Pachickara.

शिकागो स्टाइल उद्धरण

Chacko, P. E. Safety Engineering. Rev. ed. Thodupuzha: Rose Chacko Pachickara, 1972.

एमएलए उद्धरण

Chacko, P. E. Safety Engineering. Rev. ed. Rose Chacko Pachickara, 1972.