Gu, Ning and Maher, Mary Lou. "Frontmatter". Designing Adaptive Virtual Worlds, Warsaw, Poland: De Gruyter Open Poland, 2014, pp. I-IV. https://doi.org/10.2478/9783110367669.fm
Gu, N. & Maher, M. (2014). Frontmatter. In Designing Adaptive Virtual Worlds (pp. I-IV). Warsaw, Poland: De Gruyter Open Poland. https://doi.org/10.2478/9783110367669.fm
Gu, N. and Maher, M. 2014. Frontmatter. Designing Adaptive Virtual Worlds. Warsaw, Poland: De Gruyter Open Poland, pp. I-IV. https://doi.org/10.2478/9783110367669.fm
Gu, Ning and Maher, Mary Lou. "Frontmatter" In Designing Adaptive Virtual Worlds, I-IV. Warsaw, Poland: De Gruyter Open Poland, 2014. https://doi.org/10.2478/9783110367669.fm
Gu N, Maher M. Frontmatter. In: Designing Adaptive Virtual Worlds. Warsaw, Poland: De Gruyter Open Poland; 2014. p.I-IV. https://doi.org/10.2478/9783110367669.fm