APA (7th ed.) Zitazioa
Engel, A. S. (2015). Microbial life of cave systems. De Gruyter.
Chicago Style (17th ed.) Zitazioa
Engel, Annette Summers. Microbial Life of Cave Systems. Berlin, Germany ; Boston, [Massachusetts]: De Gruyter, 2015.
MLA (9th ed.) Zitazioa
Engel, Annette Summers. Microbial Life of Cave Systems. De Gruyter, 2015.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.