The basis of passional psychology :
a study of the laws of love in man and the lower animals /
by Dr. Jacobus X.

APA Citation

X, J. (1901). The basis of passional psychology: a study of the laws of love in man and the lower animals. Paris: Charles Carrington.

MLA Citation

X, Jacobus. The Basis of Passional Psychology: a Study of the Laws of Love In Man And the Lower Animals. Paris: Charles Carrington, 1901.

Warning: These citations may not always be complete (especially for serials).