Winthrop, W. The problem of the Philippines: Racial, commercial, religious, political, and social conditions. [publisher not identified].
Chicago-referens (17:e uppl.)Winthrop, W. The Problem of the Philippines: Racial, Commercial, Religious, Political, and Social Conditions. [place of publication not identified]: [publisher not identified].
MLA-referens (9:e uppl.)Winthrop, W. The Problem of the Philippines: Racial, Commercial, Religious, Political, and Social Conditions. [publisher not identified].
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.