Marcos, F. E. (1967). Excerpts from the major speeches of President Ferdinand E. Marcos in 1966: The challenge accepted. s.n.
Chicago-referens (17:e uppl.)Marcos, Ferdinand Edralin. Excerpts from the Major Speeches of President Ferdinand E. Marcos in 1966: The Challenge Accepted. [S.l: s.n, 1967.
MLA-referens (9:e uppl.)Marcos, Ferdinand Edralin. Excerpts from the Major Speeches of President Ferdinand E. Marcos in 1966: The Challenge Accepted. s.n, 1967.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.