APA (7th ed.) Citation

Welch, H. J., & Ouden, P. d. (1991). The conifer manual. Kluwer Academic Publishers.

Chicago Style (17th ed.) Citation

Welch, H. J., and P. den Ouden. The Conifer Manual. Dordrecht: Kluwer Academic Publishers, 1991.

MLA (9th ed.) Citation

Welch, H. J., and P. den Ouden. The Conifer Manual. Kluwer Academic Publishers, 1991.