एपीए उद्धरण

GRIBBIN, J. (1998). WATCHING THE UNIVERSE. UNIVERSITIES PRESS.

शिकागो स्टाइल उद्धरण

GRIBBIN, JOHN. WATCHING THE UNIVERSE. Hyderabad: UNIVERSITIES PRESS, 1998.

एमएलए उद्धरण

GRIBBIN, JOHN. WATCHING THE UNIVERSE. UNIVERSITIES PRESS, 1998.