APA Style
Ludlum, Robert. (2001).
The Sigma Protocol .
New York:
St. Martin\'s Paperbacks.
Chicago Style
Ludlum, Robert.
The Sigma Protocol.
New York:
St. Martin\'s Paperbacks,
2001.
Text.
MLA Style
Ludlum, Robert.
The Sigma Protocol.
New York:
St. Martin\'s Paperbacks,
2001.
Text.
Turabian Style
Ludlum, Robert.
The Sigma Protocol.
New York:
St. Martin\'s Paperbacks,
2001.
Print.