To cite crawl in publications:

  Johnson, D. S., London, J. M., Lea, M.-A. and Durban, J. W. (2008)
  Continuous-time correlated random walk model for animal telemetry
  data. Ecology, 89: 1208-1215.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Continuous-time correlated random walk model for animal telemetry data},
    author = {D.S. Johnson and J.M. London and M.-A. Lea and J.W. Durban},
    journal = {Ecology},
    year = {2008},
    volume = {89},
    number = {5},
    pages = {1208-1215},
    doi = {10.1890/07-1032.1},
  }