Iowa. State College of Agriculture and Mechanic, Atrs, Ames. Statistical Laboratory. Report. s.n.
Cita Chicago (17th ed.)Iowa. State College of Agriculture and Mechanic, Atrs, Ames. Statistical Laboratory. Report. s.l: s.n.
Cita MLA (9th ed.)Iowa. State College of Agriculture and Mechanic, Atrs, Ames. Statistical Laboratory. Report. s.n.
Atenció: Aquestes cites poden no estar 100% correctes.