Cita APA (7a ed.)

Levitt, I. M. (1974). Beyond the known universe: From dwarf stars to quasars. Viking Press.

Cita Chicago Style (17a ed.)

Levitt, Israel Monroe. Beyond the Known Universe: From Dwarf Stars to Quasars. New York: Viking Press, 1974.

Cita MLA (9a ed.)

Levitt, Israel Monroe. Beyond the Known Universe: From Dwarf Stars to Quasars. Viking Press, 1974.