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Multilingual
1
Welford, W T, 425-W445o | Oxford University Press | 1981 425-W445o,
2
Taylor, Welford Dunaway, 659.3-T247w | David R. Godine Publisher | 1999 659.3-T247w,
3
Taylor, Welford Dunaway, 074.2-T247n | Iowa State University Press | 1991 074.2-T247n,
4
Welford, Richard, 325.092-W445e | Pitman Publishing | 1996 325.092-W445e,
5
Welford, Richard, 539.9-W445호 | 미래경영연구소 | 1995 539.9-W445호,