€ 7,00
(ca. 1910). 43 p. Wrappers. (Groote denkers II,5) (See: bdespinoza.blogspot.com/2019/08/julius-de-boer-1873-1966-bollandiaan.html)
Baarn, Hollandia-drukkerij, n.d.
Groningen, Batavia, Wolters, 1944.
Oxford, Clarendon Press, 1971.
Utrecht, Kemink, 1855.
Oxford, Clarendon Press, 1986.