Masters, E. L. (1977). Gettysburg, Manila, Acoma [microform]. Photoduplication Service. University of the Philippines Library.
芝加哥风格引文Masters, Edgar Lee. Gettysburg, Manila, Acoma [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.
MLA引文Masters, Edgar Lee. Gettysburg, Manila, Acoma [microform]. Photoduplication Service. University of the Philippines Library, 1977.
警告：这些引文格式不一定是100％准确.