Bull, L. B. The pyrrolizidine alkaloids : their chemistry-pathogenicity and other biological properties / L.B. Bull, C.C.J. Culvenor and A.T. Dick. - Amsterdam : North-Holland Pub., 1968. - xv, 293 p. ; - Frontiers of biology (Amsterdam), v. 9 . ISBN: ISBNSc2298 Subjects--Topical Terms: Alkaloids. Dewey Class. No.: 572.549 / Py