Meuleman. Commentatio literaria de Zenone Stoico. Groningen, 1858.
Troost, K. Z. Citiensis de rebus physicis doctrina. 1891. (PP. 4991 e.)
Wachsmuth, C. Commentatio de Zenone Citiensi. 1874.
Wellmann, E. Die Philosophie des Stoïker’s Z. 1873.
Zoroaster. See article by Karl F. Geldner in the Encyclopaedia Britannica. Zoroaster the prophet of ancient Iran, by A. V. Williams-Jackson. New York, 1899. (4505 eee 9.) See also Philo (Mills).
II. MODERN WRITERS.
Aall, Anathon. Der Logos. Geschichte seiner Entwicklung in d. griech. Philosophie und in d. christlichen Literatur. 2 vols. 1896, 9. (08461 h 8.)
Adam, James. The religious teachers of Greece. 1908. (4506 i 7.)
Allard, P. Le Christianisme et l’Empire romain de Néron à Théodose. 2nd ed., 1897. (2208 a.)