Gaya APA
Ponta, G, M, L., Onac, B, P.
(2019).
Cave and Karst Systems of Romania
(
1st ed.)
.
Cham:
Springer.
Gaya MLA
Ponta, Gheorghe, M., L.., Onac, Bogdan, P..
"Cave and Karst Systems of Romania".
1st ed.
Cham:
Springer,
2019.
E Book.