Gaya APA

Helmut, D. (1969). Gel Chromatografphy Gel Filtration. Gel Permeation Moleculer Sieves . New york: Sringer Verlag.

Gaya MLA

Helmut, Determann. "Gel Chromatografphy Gel Filtration. Gel Permeation Moleculer Sieves". New york: Sringer Verlag, 1969. Text.