"Since that mention in the 2006, investment in switch grass has exploded, thanks in large part, experts say, to the President's speech. Venture capitalists have poured over $100 million into private companies that are exploring the technology necessary to convert switchgrass into fuel, and large publicly owned companies are also directing their research dollars into biofuels."Jessica Yellin; Katie Hinman; Nitya Venkataraman (23 Ocak 2007). "What Happened to Bush Call for Switchgrass?". ABC News. 21 Temmuz 2024 tarihinde kaynağından arşivlendi. Erişim tarihi: 21 Temmuz 2024.
Ball, D.M.; Hoveland, C.S.; Lacefield, G.D. (2002). Southern Forages. 3rd. International Plant Nutrition Institute. s. 26. ISBN978-0-9629598-3-7. 19 Kasım 2012 tarihinde kaynağından arşivlendi. Erişim tarihi: 21 Temmuz 2024.
"The Pink Streak Dargida rubripennis"(PDF). Natural Heritage & Endangered Species Program. Massachusetts Division of Fisheries & Wildlife. September 2012. 8 Haziran 2017 tarihinde kaynağından(PDF) arşivlendi. Erişim tarihi: 5 Ocak 2018.
Ball, D.M.; Hoveland, C.S.; Lacefield, G.D. (2002). Southern Forages. 3rd. International Plant Nutrition Institute. s. 26. ISBN978-0-9629598-3-7. 19 Kasım 2012 tarihinde kaynağından arşivlendi. Erişim tarihi: 21 Temmuz 2024.
"The Pink Streak Dargida rubripennis"(PDF). Natural Heritage & Endangered Species Program. Massachusetts Division of Fisheries & Wildlife. September 2012. 8 Haziran 2017 tarihinde kaynağından(PDF) arşivlendi. Erişim tarihi: 5 Ocak 2018.
"Since that mention in the 2006, investment in switch grass has exploded, thanks in large part, experts say, to the President's speech. Venture capitalists have poured over $100 million into private companies that are exploring the technology necessary to convert switchgrass into fuel, and large publicly owned companies are also directing their research dollars into biofuels."Jessica Yellin; Katie Hinman; Nitya Venkataraman (23 Ocak 2007). "What Happened to Bush Call for Switchgrass?". ABC News. 21 Temmuz 2024 tarihinde kaynağından arşivlendi. Erişim tarihi: 21 Temmuz 2024.