Gaya APA
Visher, G, S. (1990).
Exploration stratigraphy, second ed./ foto copy (Second Edition).
Tulsa-Oklahoma:
Penn Well Books.
Gaya MLA
Visher, Glenn, S.
"Exploration stratigraphy, second ed./ foto copy".
Second Edition
Tulsa-Oklahoma:
Penn Well Books,
1990.
Text.