APA

Liukas L., .Hello Ruby - Expedition to the Internet. : Macmillan US.

Chicago

Liukas Linda, .Hello Ruby - Expedition to the Internet. : Macmillan US.

Harvard

Liukas L., .Hello Ruby - Expedition to the Internet. : Macmillan US.

MLA

Liukas Linda, .: Macmillan US. .