Παραπομπή σε μορφή APA (7η εκδ.)

Snelgrove, D. A. K. (1960). Opportunities in geology and geological engineering. Vocational Guidance Manuals.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Snelgrove, Dr. Alfred Kitchener. Opportunities in Geology and Geological Engineering. New York: Vocational Guidance Manuals, 1960.

Παραπομπή σε μορφή MLA (9th εκδ.)

Snelgrove, Dr. Alfred Kitchener. Opportunities in Geology and Geological Engineering. Vocational Guidance Manuals, 1960.