(1906). Porto Rico Agricultural Experiment Station Circular Under the Supervision of Office of Experiment Stations, U.S. Department of Agriculture. Government Printing Office.
Chicago-Zitierstil (17. Ausg.)Porto Rico Agricultural Experiment Station Circular Under the Supervision of Office of Experiment Stations, U.S. Department of Agriculture. Washington: Government Printing Office, 1906.
MLA-Zitierstil (9. Ausg.)Porto Rico Agricultural Experiment Station Circular Under the Supervision of Office of Experiment Stations, U.S. Department of Agriculture. Government Printing Office, 1906.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.