APA aipamena

Bertsch, F., & Henríquez, C. (2015). 2015: International Year of Soils.

Chicago Style aipamena

Bertsch, Floria, y Carlos Henríquez. 2015: International Year of Soils. 2015.

MLA aipamena

Bertsch, Floria, y Carlos Henríquez. 2015: International Year of Soils. 2015.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.