On the 80th birthday of Paul J.M. Maas.

MLA

Erkens, R. H. J., and H. ter Steege. “On the 80th Birthday of Paul J.M. Maas.” Blumea, vol. 64, no. 1, Jan. 2019, pp. i–ii. EBSCOhost, https://doi.org/10.3767/blumea.2019.64.01.00.

APA

Erkens, R. H. J., & ter Steege, H. (2019). On the 80th birthday of Paul J.M. Maas. Blumea, 64(1), i–ii. https://doi.org/10.3767/blumea.2019.64.01.00

Chicago

Erkens, R. H. J., and H. ter Steege. 2019. “On the 80th Birthday of Paul J.M. Maas.” Blumea 64 (1): i–ii. doi:10.3767/blumea.2019.64.01.00.