APA

Grupe F. H., . (1990). Beginning dBase IV. Dubuque, Iowa: Wm. C. Brown Publishers.

Chicago

Grupe Fritz H, . 1990. Beginning dBase IV. Dubuque, Iowa: Wm. C. Brown Publishers.

Harvard

Grupe F. H., . (1990). Beginning dBase IV. Dubuque, Iowa: Wm. C. Brown Publishers.

MLA

Grupe Fritz H, . Beginning dBase IV. Dubuque, Iowa: Wm. C. Brown Publishers. 1990.