APA (7th ed.) Citation

Johns, R. J., & Stevens, P. F. (1974). Mount Wilhelm flora: A check list of the species (Rev. ed.). Division of Botany.

Chicago Style (17th ed.) Citation

Johns, R. J., and P. F. Stevens. Mount Wilhelm Flora: A Check List of the Species. Rev. ed. Lae: Division of Botany, 1974.

MLA (9th ed.) Citation

Johns, R. J., and P. F. Stevens. Mount Wilhelm Flora: A Check List of the Species. Rev. ed. Division of Botany, 1974.