APA
Pennock R. T., . (1999). Tower of Babel. Cambridge, MA: A Bradford book.
Chicago
Pennock Robert T, . 1999. Tower of Babel. Cambridge, MA: A Bradford book.
Harvard
Pennock R. T., . (1999). Tower of Babel. Cambridge, MA: A Bradford book.
MLA
Pennock Robert T, . Tower of Babel. Cambridge, MA: A Bradford book. 1999.