To cite asymLD in publications use:

  Glenys Thomson, Richard M. Single (2014). Conditional Asymmetric
  Linkage Disequilibrium (ALD): Extending the Biallelic r2 Measure.
  Genetics, 198(1), 321-331. URL
  http://www.genetics.org/content/198/1/321

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Conditional Asymmetric Linkage Disequilibrium (ALD): Extending the Biallelic r2 Measure},
    author = {Glenys Thomson and Richard M. Single},
    journal = {Genetics},
    year = {2014},
    volume = {198},
    number = {1},
    pages = {321--331},
    url = {http://www.genetics.org/content/198/1/321},
    publisher = {Genetics Soc America},
  }