Fitz, J. (1892). Sweet potato culture. Giving full instructions from Starting the Plants to Harvesting and Storing the Crop: научное издание.
Chicago-referens (17:e uppl.)Fitz, J. Sweet Potato Culture. Giving Full Instructions from Starting the Plants to Harvesting and Storing the Crop: научное издание. 1892.
MLA-referens (9:e uppl.)Fitz, J. Sweet Potato Culture. Giving Full Instructions from Starting the Plants to Harvesting and Storing the Crop: научное издание. 1892.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.