APA-referens (7:e uppl.)

Romulo, C. P. (1971). In the mainstream of diplomacy. Office of Press and Public Affairs, Dept. of Foreign Affairs.

Chicago-referens (17:e uppl.)

Romulo, Carlos Pena. In the Mainstream of Diplomacy. [Manila: Office of Press and Public Affairs, Dept. of Foreign Affairs, 1971.

MLA-referens (9:e uppl.)

Romulo, Carlos Pena. In the Mainstream of Diplomacy. Office of Press and Public Affairs, Dept. of Foreign Affairs, 1971.