APA   Click to copy
Marquis, R. J. (2005). Piperales (Encyclopedia of Life Sciences (eLS). Wiley-Blackwell.

Chicago/Turabian   Click to copy
Marquis, Robert J. “Piperales.” Encyclopedia of Life Sciences (eLS). Wiley-Blackwell, 2005.

MLA   Click to copy
Marquis, Robert J. Piperales. Encyclopedia of Life Sciences (eLS), Wiley-Blackwell, 2005.

@inbook{marquis2005a,
  title = {Piperales},
  year = {2005},
  edition = {Encyclopedia of Life Sciences (eLS)},
  publisher = {Wiley-Blackwell},
  author = {Marquis, Robert J.},
  howpublished = {Online: https://doi.org/10.1038/npg.els.0003700}
}