Gaya APA
Monthly Bulletin of the Hawaiian Volcano Observatory Vol. IX Honolulu, Hawaii, June, 1921 No. 6. ().
HAWAII:
U.S. Departemen of Agriculture.
Gaya MLA
Monthly Bulletin of the Hawaiian Volcano Observatory Vol. IX Honolulu, Hawaii, June, 1921 No. 6.
.
HAWAII:
U.S. Departemen of Agriculture,
.
.