Helmsing, P. J. (1969). Isolation and purification of galactolipids and galactolipase. M.H. Tunnessen.
Lua i Stíl Chicago (17ú heag.)Helmsing, Pieter Johannes. Isolation and Purification of Galactolipids and Galactolipase. Malden [etc.]: M.H. Tunnessen, 1969.
Lua MLA (8ú heag.)Helmsing, Pieter Johannes. Isolation and Purification of Galactolipids and Galactolipase. M.H. Tunnessen, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.