by Prendinger, Helmut, Ishizuka, Mitsuru and Lester, James
Reference:
Intelligent virtual agents (Prendinger, Helmut, Ishizuka, Mitsuru and Lester, James), Springer, 2008.
Bibtex Entry:
@misc{prendinger2008intelligent, title= {Intelligent virtual agents}, author= {Prendinger, Helmut and Ishizuka, Mitsuru and Lester, James}, year= {2008}, publisher= {Springer}}