APA (7th ed.) Citation

(1921). New petroleum deposits in Portuguese East Africa. [publisher not identified].

Chicago Style (17th ed.) Citation

New Petroleum Deposits in Portuguese East Africa. Washington, D.C.: [publisher not identified], 1921.

MLA (9th ed.) Citation

New Petroleum Deposits in Portuguese East Africa. [publisher not identified], 1921.

Warning: These citations may not always be 100% accurate.