APA
UNITED STATES DEPTT OF THE INTERIOR, . (1968). EARTH MANNUAL. CALCUTTA: OXFORD.
Chicago
UNITED STATES DEPTT OF THE INTERIOR, . 1968. EARTH MANNUAL. CALCUTTA: OXFORD.
Harvard
UNITED STATES DEPTT OF THE INTERIOR, . (1968). EARTH MANNUAL. CALCUTTA: OXFORD.
MLA
UNITED STATES DEPTT OF THE INTERIOR, . EARTH MANNUAL. CALCUTTA: OXFORD. 1968.