Primary Sources
A Primer of Logical Analysis for the Use of Composition Students (1881)
The Religious Aspect of Philosophy (1885)
California &c: A Study of American Character (1886)
The Feud of Oakfield Creek: A Novel of California Life (1887)
The Spirit of Modern Philosophy: An Essay in the Form of Lectures (1892)
The Conception of God (1897)
Studies of Good and Evil (1898)
The World and the Individual (2 vols) (1899-1901)
The Conception of Immortality (1900)
Outlines of Psychology (1903)
Race Questions, Provincialism, and Other American Problems (1908)
The Philosophy of Loyalty (1908)
William James and Other Essays on the Philosophy of Life (1911)
The Sources of Religious Insight (1912)
The Problem of Christianity (2 vols) (1913)
The Hope of the Great Community (1916)
L. Loewenberg, ed: Fugitive Essays (1920)
D. Robinson, ed; Royce's Logical Essays (1951)
J. Clendenning, ed: The Letters of Josiah Royce (1970)

Secondary Sources
C.I.Lewis: A Survey of Symbolic Logic