Hubert, P. G. (2001). Men of achievement: Inventors. Digital Scanning.
Chicago-čujuhus (17. p.)Hubert, Philip Gengembre. Men of Achievement: Inventors. Scituate, Mass.: Digital Scanning, 2001.
MLA-čujuhus (9. p.)Hubert, Philip Gengembre. Men of Achievement: Inventors. Digital Scanning, 2001.
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