Cresswell, C. F., Hageman, R. H., Hewitt, E. J., & Hucklesby, D. P. (1965). The reduction of nitrate, nitrite and hydroxylamine to ammonia by enzymes from Cucurbita pepo L. in the presence of reduced benzyl viologen as electron donor.

Cresswell, C. F., R. H. Hageman, E. J. Hewitt, ja D. P. Hucklesby. The Reduction of Nitrate, Nitrite and Hydroxylamine to Ammonia By Enzymes From Cucurbita Pepo L. in the Presence of Reduced Benzyl Viologen As Electron Donor. 1965.

Cresswell, C. F., R. H. Hageman, E. J. Hewitt, ja D. P. Hucklesby. The Reduction of Nitrate, Nitrite and Hydroxylamine to Ammonia By Enzymes From Cucurbita Pepo L. in the Presence of Reduced Benzyl Viologen As Electron Donor. 1965.