Παραπομπή σε μορφή APA (7η εκδ.)

Hillman, D. J. (1964). Mathematical theories of relevance with respect to the problems of indexing. National Science Foundation.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hillman, Donald J. Mathematical Theories of Relevance with Respect to the Problems of Indexing. Bethlehem, Pa.: National Science Foundation, 1964.

Παραπομπή σε μορφή MLA (8th εκδ.)

Hillman, Donald J. Mathematical Theories of Relevance with Respect to the Problems of Indexing. National Science Foundation, 1964.