"Frontmatter". Microbial Life of Cave Systems, edited by Annette Summers Engel, Berlin, München, Boston: De Gruyter, 2015, pp. I-IV. https://doi.org/10.1515/9783110339888-fm
(2015). Frontmatter. In A. Summers Engel (Ed.), Microbial Life of Cave Systems (pp. I-IV). Berlin, München, Boston: De Gruyter. https://doi.org/10.1515/9783110339888-fm
2015. Frontmatter. In: Summers Engel, A. ed. Microbial Life of Cave Systems. Berlin, München, Boston: De Gruyter, pp. I-IV. https://doi.org/10.1515/9783110339888-fm
"Frontmatter" In Microbial Life of Cave Systems edited by Annette Summers Engel, I-IV. Berlin, München, Boston: De Gruyter, 2015. https://doi.org/10.1515/9783110339888-fm
Frontmatter. In: Summers Engel A (ed.) Microbial Life of Cave Systems. Berlin, München, Boston: De Gruyter; 2015. p.I-IV. https://doi.org/10.1515/9783110339888-fm