APA (7th ed.) Citation

Não informado. (1990). Geo info systems. Advanstar Communications.

Chicago Style (17th ed.) Citation

Não informado. Geo Info Systems. Duluth, Minn: Advanstar Communications, 1990.

MLA (8th ed.) Citation

Não informado. Geo Info Systems. Advanstar Communications, 1990.

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