@article{herrnstein_morse_1956, 
  title={Selective Action of Pentobarbital on Component Behaviors of a Reinforcement Schedule}, 
  volume={124}, 
  DOI={10.1126/science.124.3217.367}, 
  number={3217}, 
  publisher={American Association for the Advancement of Science (AAAS)}, 
  author={HERRNSTEIN and MORSE}, 
  year={1956}, 
  month={Aug}
  }