Ohio Wine Producers Association. (2016). Portage Hills Vineyards, 1990s. https://oaks.kent.edu/node/5977
Ohio Wine Producers Association. 2016. “Portage Hills Vineyards, 1990s”. https://oaks.kent.edu/node/5977.
Ohio Wine Producers Association. Portage Hills Vineyards, 1990s. 30 June 2016, https://oaks.kent.edu/node/5977.