Years ago only publication in journals would meet the needs for currency and for peer validation. Scholarly monographs, encyclopedias, and data collections have become even less credible because they contain information that is obsolete by the day of publication. It is a medium with no inherent level of quality. It is your responsibility to validate each site you want to use in your assignment. Look for currency, credibility of author or sponsoring organization, balance, thoroughness, organization and understandability of text and graphics.
Latest issue is available on the internet.
The Online Geographical Bibliography is a searchable file of 1985-1997 issues. A bibliography of books, periodical articles, pamphlets, government documents, maps and atlases. This is the only index that exclusively covers the whole discipline of geography. GeoBase 1980-current covering major commercially published journals. Very selective current file in geography, geology, ecology and related fields.