APA (7th ed.) Citation

Valls i Subirà, O., & Simmons, J. S. G. (1970). Paper and watermarks in Catalonia. Paper Publ. Soc.

Chicago Style (17th ed.) Citation

Valls i Subirà, Oriol, and John Simon Gabriel Simmons. Paper and Watermarks in Catalonia. Amsterdam: Paper Publ. Soc, 1970.

MLA (9th ed.) Citation

Valls i Subirà, Oriol, and John Simon Gabriel Simmons. Paper and Watermarks in Catalonia. Paper Publ. Soc, 1970.