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by Vitale, Robert; Pfoertsch, Waldemar; Giglierano, Joseph
by Philip Kotler; Waldemar Pfoertsch; Uwe Sponholz
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by Yeung, Arthur; Xin, Katherine; Pfoertsch, Waldemar; et al.
by Kotler, Philip; Dingena, Marian; Pfoertsch, Waldemar
by Philip Kotler; Marian Dingena; Waldemar Pfoertsch
by Kotler, Philip; Pfoertsch, Waldemar
by Arthur Yeung; Katherine Xin; Waldemar Pfoertsch; et al.