Wiedemann, E., and Schmidt, G. W.: 1895a, Ueber Luminescenz. Wied. Ann. d. Phy. u. Chem., vol. liv, pp. 604-625; 1895b, vol. lvi, pp. 201-254.
Wielowiejski, H. R. v.: 1882, Studien ueber die Lampyriden. Ztschr. f. wiss. Zool., Bd. xxxvii, pp. 354-428.
Williams, F. X.: 1916, Photogenic Organs and Embryology of Lampyrids. Journ. Morph., vol. xxviii, pp. 145-186.
Yatsu, N.: 1917, Note on the Structure of the Maxillary Gland of Cypridina hilgendorfii. Journ. Morph., vol. xxix, pp. 435-440.
Young, C. A.: 1870, The Spectrum of the Firefly. Amer. Nat., vol. iii, p. 615.
Zacharias, O.: 1905, Beobachtungen ueber das Leuchtvermögen von Ceratium tripos. Biol. Ctbl., Bd. xxv, pp. 20-30.