Omphalos - Roscher, Wilhelm Heinrich, 1845-1923 (Georg Olms Verlag, 1974)
Reprint of the 1913 ed. of Omphalos and the 1918 ed. of Der Omphalosgedanke bei verschiedenen Völkern, besonders den semitischen, published by B. G. Teubner, Leipzig, which were issued respectively as Bd. 70, Heft 2 of the Sitzungsberichte of the Sächsische Gesellschaft der Wissenschaften, Leipzig, Philologisch-Historische Klasse.