^ abHershey The Chocolate Town. The Hershey Press. 1916. p. 22.
^ ab"ZooAmerica Will Open At Hershey". The Daily News. Huntingdon, PA. p. 16. Zooamerica [sic] marks the first time that Herhseypark has expanded outside the original 65 acres established when the park was redeveloped into a theme park in 1972.
^Sullivan, Deborah (January 29, 1987). "Hersheypark Unveils Plans For New Four Million Dollar Water Ride To Open During 1987 Season" (Press release). Hershey Entertainment & Resorts Company.
^"Excerpt from Park World magazine"(PDF). Park World. July 2007. p. 26. Retrieved May 7, 2016. In May 1994 Hersheypark opened Tidal Force, the world's tallest water plunge ride. With the opening of the new ride, supplied by OD Hopkins, Hersheypark expanded to 90 acres.