last: Surname of author. Do not wikilink—use authorlink instead. Where the surname is usually written first—as in Chinese—or for corporate authors, simply use last to include the same format as the source. Aliases: last1, author, authors, author1.
first: Given or first names of author, including title(s); for example: Firstname Middlename or Firstname M. or Dr. Firstname M., Sr. Do not wikilink—use authorlink instead. Aliases: first1. Requires last; first name will not display if last is empty.
OR: for multiple authors, use last1, first1 through last9, first9 for up to nine authors. By default, if nine authors are defined, then only eight will show and "et al." will show in place of the last author. See the display parameters to change. Aliases: author1 through author9.
authorlink: Title of existing Wikipedia article about the author—not the author's website; do not wikilink. Aliases: authorlink1, author-link, author1-link, author1link.
OR: for multiple authors, use authorlink1 through authorlink9. Aliases: author1-link through author9-link.