Waldemar Pfoertsch
发表
Philip Kotler,
Waldemar Pfoertsch,
2010
.
Waldemar Pfoertsch,
Johannes Rid,
2014
.
Waldemar Pfoertsch,
Frederick Beuk,
Waldemar Pfoertsch,
2007
.
Waldemar Pfoertsch,
Philip Kotler,
P. Kotler,
2006
.