Wolf, P. G., Pryer, K. M., Smith, A. R., & Hasebe, M. (1998). Phylogenetic studies of extant pteridophytes. In Molecular systematics of plants II (pp. 541–556). Springer, Boston, MA.

Wolf, P. G., K. M. Pryer, A. R. Smith, and M. Hasebe. “Phylogenetic studies of extant pteridophytes.” In Molecular Systematics of Plants II, 541–56. Springer, Boston, MA, 1998.

Wolf PG, Pryer KM, Smith AR, Hasebe M. Phylogenetic studies of extant pteridophytes. In: Molecular systematics of plants II. Springer, Boston, MA; 1998. p. 541–56.

Wolf, P. G., et al. “Phylogenetic studies of extant pteridophytes.” Molecular Systematics of Plants II, Springer, Boston, MA, 1998, pp. 541–56.

Wolf PG, Pryer KM, Smith AR, Hasebe M. Phylogenetic studies of extant pteridophytes. Molecular systematics of plants II. Springer, Boston, MA; 1998. p. 541–556.