Michael Nahm, Willy Tegel, and Christian Gold. “A Search for Naturally Grown Burgundy Truffles (Tuber Aestivum) in Hazelnut Plantations in Germany: Results of a Survey”. Agriculture and Natural Resources 53, no. 1 (February 28, 2019): 84–86. Accessed May 1, 2024. https://li01.tci-thaijo.org/index.php/anres/article/view/251661.