Gaya APA
O'Dunn, S., Sill, W, D. (1986).
EXPLORING GEOLOGY; Introductory Laboratory Activities O'Dunn and Sill .
New Jersey:
prentce-hall.
Gaya MLA
O'Dunn, Shannon., Sill, William, D..
"EXPLORING GEOLOGY; Introductory Laboratory Activities O'Dunn and Sill".
New Jersey:
prentce-hall,
1986.
Text.