Παραπομπή σε μορφή APA (7η εκδ.)

Spisani, F. (1990). The new directed numbers. Centro Superiore di Logica e Scienze Comparate.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Spisani, Franco. The New Directed Numbers. Bolonia: Centro Superiore di Logica e Scienze Comparate, 1990.

Παραπομπή σε μορφή MLA (9th εκδ.)

Spisani, Franco. The New Directed Numbers. Centro Superiore di Logica e Scienze Comparate, 1990.