Quesenberry, K.H. and N.L. Taylor. 1976. Interspecific hybridization in Trifolium L. Sect. Trifolium Zoh. I. Diploid hybrids among T. alpestre L., T. rubens L., T. heldreichianum Housskn, and T. noricum Wulf. Crop Sci. 16:382-386.
Authors: Norman Taylor