Abderhalden, E.—"Neuere Ergebnisse auf dem Gebiete der Speziellen Eiweisschemie," 128 pages, Jena, 1909.
Fischer, E.—"Untersuchungen über Aminosäuren, Polypeptide, und Proteine, 1899-1906," 770 pages, Berlin, 1906.
Mann, G.—"Chemistry of the Proteids," 606 pages, London, 1906.
Osborne, T. B.—"The Vegetable Proteins," 138 pages, Monographs on Biochemistry, London, 1909.
Plimmer, R. H. A.—"The Chemical Constitution of the Proteins, Part I, Analysis," 188 pages; and "Part II, Synthesis, etc." 107 pages, Monographs on Biochemistry, London, 1917. (3d ed.).
Robertson, T. B.—"The Physical Chemistry of the Proteins," 477 pages, New York, 1918.
Schryber, S. B.—"The General Characters of the Proteins," 86 pages, Monographs on Biochemistry, London, 1909.
Underhill, F. P.—"The Physiology of the Amino-acids," 169 pages, 13 figs. 1 plate. Yale University Press, 1915.