PUIA, Ioan, and Attila T. SZABO. β€œOn the Systematic Position of Red Clover (Trifolium Pratense L.)”. Notulae Botanicae Horti Agrobotanici Cluj-Napoca 9, no. 1 (August 5, 1977): 47–50. Accessed August 13, 2022. https://www.notulaebotanicae.ro/index.php/nbha/article/view/30.