Effects of the storage conditions on the stability of natural and synthetic cannabis in biological matrices for forensic toxicology analysis: An update from the literature
Morris, Richard B. (1996). Encyclopedia of American History (Seventh izd.). Collins Reference. ISBN0062700553.
Peter C. Mancall, Gary B. Nash, Allan M. Winkler, Charlene Mires, John W. Jeffries, ur. (2009). Encyclopedia of American History. Facts on File. ISBN0816071365.
Stanley I. Kutler (2002). Dictionary of American History (Third izd.). Charles Scribners & Sons. ISBN0684805332.
Paul S. Boyer (2001). The Oxford Companion to United States History. Oxford University Press. ISBN0195082095.