«THE BASE-BALL SEASON»(PDF). The New York Times. 24 de junio de 1883. – (New York Times reporting on the Providence/New York game of June 23, 1883) "Denny drove the ball into the bull pen in the sixth inning, and would have secured a home run without the ball going outside the fence had he not stepped directly over instead of upon the bag at third base, the umpire giving him out." – retrieved March 10, 2010 – The term here refers to an area of the field that was in-play. Unstated are the specific purpose of the bullpen and whether the area was in fair or foul territory.
«CUBS BAT MARQUARD OUT OF BOX AND WIN»(PDF). The New York Times. 18 de septiembre de 1912. – (New York Times reporting on the Cubs/Giants game of September 17, 1912) "Chicago began to get worried, and Richie, Ruelbach, and Lavender were rushed to the bullpen to get warmed up and be ready to relieve the weakening Cheney at a minute's notice." – retrieved October 20, 2009
