Most digital libraries make extended document metadata available for the purpose of citation. This metadata has commonly been provided in human readable format, but more and more digital libraries are beginning to offer this information in convenient machine readable formats. At the same time, many advances have been made in cataloging and accessing documents and their associated metadata. We are witnessing the early evolution of bibliographic web services. In this paper we introduce an application (CITEX) for compiling bibliographies dynamically from bibliographic web services as they currently exist and we explore some of the challenges associated with providing bibliographic information, suggesting future paths for bibliographic web services.