Cita APA (7th ed.)

Black, C., & Hart, T. (2017). Variation in the phenology of Pygoscelis penguins.

Cita Chicago (17th ed.)

Black, C., i T. Hart. Variation in the Phenology of Pygoscelis Penguins. 2017.

Cita MLA (9th ed.)

Black, C., i T. Hart. Variation in the Phenology of Pygoscelis Penguins. 2017.

Atenció: Aquestes cites poden no estar 100% correctes.