Citazione APA

Passens, B., & Scholl, I. (1991). Wordperfect: Version 6.0. Prisma computer course.

Stile di citazione Chicago

Passens, Bernd, e Ingrid Scholl. Wordperfect: Version 6.0. London: Prisma computer course, 1991.

Citazione MLA

Passens, Bernd, e Ingrid Scholl. Wordperfect: Version 6.0. Prisma computer course, 1991.