Crossmark Policy
CrossMark is a multi-publisher initiative from crossref to provide a standard way for readers to locate the current version of a piece of content. By applying the CrossMark logo (Universitas Muhammadiyah Ponorogo) is committing to maintaining the content is publishes and to alerting readers to changes if and when they occur.
Clicking on the CrossMark logo will tell you the currnet status of a document and may also give you additional publication record information about the document.
