Scientific communication in the field of educational technology was examined by analyzing references from and citations to articles published in "Educational Technology Research and Development" ("ETR&D") for the period 1990-2004 with particular emphasis on other journals found in the citation record. Data were collected on the 369 core articles found in the 60 issues published during that time period, their reference lists (containing over 14,805 individual items), and citations of those articles in other journals (1,896 entries). The top cited and citing journals during that time period are listed. Nine symbiotic journals (i.e. those that are most cited by "ETR&D" and frequently cite it) were identified: "Contemporary Educational Psychology," "Educational Psychologist," "Instructional Science," "Journal of Computer-Based Instruction" (no longer published), "Journal of Educational Computing Research," "Journal of Educational Psychology," "Journal of Educational Research," "Journal of Research in Science Teaching," and the "Review of Educational Research." The results provide an in-depth, quantitative view of informal connections within the field via the citation record. Implications for further research and the potential influence of new technologies on scientific communication are also discussed.