Gaya APA

compyon, R, R. (1972 & 1985). geology in the field (1972 & 1985). New York: New York : John Wiley & Sons, Inc.,.

Gaya MLA

compyon, Robert, R.. "geology in the field". 1972 & 1985 New York: New York : John Wiley & Sons, Inc.,, 1972 & 1985. Text.