Colquhoun, E. M. C. (1976). Two on their travels [microform]. Photoduplication Service. University of the Philippines Library.
Chicago-viite (17. p.)Colquhoun, Ethel Maud Cookson. Two on Their Travels [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1976.
MLA-viite (9. p.)Colquhoun, Ethel Maud Cookson. Two on Their Travels [microform]. Photoduplication Service. University of the Philippines Library, 1976.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.