@misc{indiciae3381ceef6207,
  title = {Applications of a simulation model to decisions in mallard management},
  author = {L.M. Cowardin and Douglas H. Johnson and T.L. Shaffer and D. W. Sparling},
  year = {1988},
  url = {https://pubs.usgs.gov/publication/2000132},
  note = {Source identifier: 2000132}
}