APA Style
Paarlberg, Don, Paarlberg, Philip. (2001).
The agricultural revolution of the 20th century .
Ames:
Iowa State Press.
Chicago Style
Paarlberg, Don, Paarlberg, Philip.
The agricultural revolution of the 20th century.
Ames:
Iowa State Press,
2001.
Text.
MLA Style
Paarlberg, Don, Paarlberg, Philip.
The agricultural revolution of the 20th century.
Ames:
Iowa State Press,
2001.
Text.
Turabian Style
Paarlberg, Don, Paarlberg, Philip.
The agricultural revolution of the 20th century.
Ames:
Iowa State Press,
2001.
Print.