(1930). U.S. global competitiveness: Optical fibers, technology and quipment. Washington: United States Trade Commission.
Trích dẫn kiểu ChicagoU.S. Global Competitiveness: Optical Fibers, Technology and Quipment. Washington: United States Trade Commission, 1930.
ציטוט MLAU.S. Global Competitiveness: Optical Fibers, Technology and Quipment. Washington: United States Trade Commission, 1930.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.