APA (7th ed.) Citation

Romeo, L. (1968). The economy of diphthongization in early Romance. Mouton.

Chicago Style (17th ed.) Citation

Romeo, Luigi. The Economy of Diphthongization in Early Romance. The Hague, Paris: Mouton, 1968.

MLA (9th ed.) Citation

Romeo, Luigi. The Economy of Diphthongization in Early Romance. Mouton, 1968.

Warning: These citations may not always be 100% accurate.