APA
Matheson G., . (1904). Voices of the Spirit. London: J. Nisbet & co., limited.
Chicago
Matheson George, . 1904. Voices of the Spirit. London: J. Nisbet & co., limited.
Harvard
Matheson G., . (1904). Voices of the Spirit. London: J. Nisbet & co., limited.
MLA
Matheson George, . Voices of the Spirit. London: J. Nisbet & co., limited. 1904.