Cita APA (7th ed.)

Drößler, R. (1990). Astronomie in Stein. Prisma Verlag.

Cita Chicago (17th ed.)

Drößler, Rudolf. Astronomie in Stein. Leipzig: Prisma Verlag, 1990.

Cita MLA (8th ed.)

Drößler, Rudolf. Astronomie in Stein. Prisma Verlag, 1990.