Gaya APA
Akai, K.
(1981).
Weak Rock: Soft, Fractured and Weathered Rock Vol. 1
.
Rotterdam:
A.A. BALKEMA PUBLISHERS.
Gaya MLA
Akai, Koichi.
"Weak Rock: Soft, Fractured and Weathered Rock Vol. 1".
Rotterdam:
A.A. BALKEMA PUBLISHERS,
1981.
Text.