Gaya APA
Gruber, Frank. (1970).
Zane Grey: A Biography .
New York:
A Signet Book.
Gaya Chicago
Gruber, Frank.
Zane Grey: A Biography.
New York:
A Signet Book,
1970.
.
Gaya MLA
Gruber, Frank.
Zane Grey: A Biography.
New York:
A Signet Book,
1970.
.
Gaya Turabian
Gruber, Frank.
Zane Grey: A Biography.
New York:
A Signet Book,
1970.
.