International Symposium "Plant species and plant communities" : Nijmegen, Van Der Maarel, E., & Werger, M. J. A. (1978). Plant species and plant communities: Proceedings of the International Symposium held at Nijmegen, November 11-12, 1976 in honour of professor Dr. Victor Westhoff on the occasion of his sixtieth birthday. Hague.
Παραπομπή σε μορφή Chicago (17η εκδ.)International Symposium "Plant species and plant communities" : Nijmegen, Eddy Van Der Maarel, και M. J. A. Werger. Plant Species and Plant Communities: Proceedings of the International Symposium Held at Nijmegen, November 11-12, 1976 in Honour of Professor Dr. Victor Westhoff on the Occasion of His Sixtieth Birthday. Boston: Hague, 1978.
Παραπομπή σε μορφή MLA (9th εκδ.)International Symposium "Plant species and plant communities" : Nijmegen, et al. Plant Species and Plant Communities: Proceedings of the International Symposium Held at Nijmegen, November 11-12, 1976 in Honour of Professor Dr. Victor Westhoff on the Occasion of His Sixtieth Birthday. Hague, 1978.