Petroff, T., & Clary, J. T. (1990). Softball hitting: Fast and slow pitch. Athletic Institute.
Citazione stile Chigago Style (17a edizione)Petroff, Tom, e Jack T. Clary. Softball Hitting: Fast and Slow Pitch. North Palm Beach, Fla.: Athletic Institute, 1990.
Citatione MLA (9a ed.)Petroff, Tom, e Jack T. Clary. Softball Hitting: Fast and Slow Pitch. Athletic Institute, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.