Dyfyniad APA

Betekhtina, O. A., & Zhuravleva, I. T. (1977). Sreda i zhiznʹ v geologicheskom proshlom: Fa︠t︡sii i organizmy. Nauka.

Dyfyniad Arddull Chicago

Betekhtina, O. A., and Inessa Tikhonovna Zhuravleva. Sreda I Zhiznʹ V Geologicheskom Proshlom: Fa︠t︡sii I Organizmy. Novosibirsk: Nauka, 1977.

Dyfyniad MLA

Betekhtina, O. A., and Inessa Tikhonovna Zhuravleva. Sreda I Zhiznʹ V Geologicheskom Proshlom: Fa︠t︡sii I Organizmy. Nauka, 1977.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.