The article is devoted to the issues of doctrinal definition, classification, and system analysis of sources of administrative law. An attention is paid to the three prevailing doctrinal approaches to the formation of a definition «sources of administrative law», advantages and disadvantages of each of them are distinguished, an expediency of a combination of general theoretical statements about the sources of law with an indication of the branch specifics is substantiated. The author notes fragmentariness and simplicity of a doctrinal study of the classification of sources of administrative law, substantiates a need of an expanded model of such a classification with the use of various criteria. The paper points to misidentification of the system and structural analysis of sources of administrative law, formulates proposals on the appropriateness of their in-depth system analysis in order to clarify a real resource in terms of reformational law-making processes.