APA

Markov N. G., Ostrast P., .The geoinformation system for WWW. : .

Chicago

Markov N G, Ostrast P.M, .The geoinformation system for WWW. : .

Harvard

Markov N. G., Ostrast P., .The geoinformation system for WWW. : .

MLA

Markov N G, Ostrast P.M, .: . .