APA (7th ed.) Zitazioa
Johnson, N. K. (1963). Biosystematics of sibling species of flycatchers in the Empidonax hammondii-oberholseri-wrightii complex. Univ. of California Pr.
Chicago Style (17th ed.) Zitazioa
Johnson, Ned K. Biosystematics of Sibling Species of Flycatchers in the Empidonax Hammondii-oberholseri-wrightii Complex. Berkeley: Univ. of California Pr, 1963.
MLA (9th ed.) Zitazioa
Johnson, Ned K. Biosystematics of Sibling Species of Flycatchers in the Empidonax Hammondii-oberholseri-wrightii Complex. Univ. of California Pr, 1963.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.