The study adopted a descriptive survey design. The population of the study comprises 1,264 Libraries academic staff in federal university of north east Nigeria. The simple random sampling technique was used in the study, giving every member of the population equal opportunity to be selected. The sample was 126 Libraries academic staff which represent 10% of the entire population. Instrument titled Availability and Extent of Utilization of Reference Sources and Services by Academic Staff Questionnaire (AEURSSASQ) was used for data collection. 20 items instrument developed by the researcher to measure the identified variables. The content validity was established by two experts in Library and Information Department. The reliability of the instrument was done by Cronbach Alpha Method. Availability coefficient value of 0.80 was obtained. This shows that the instrument was reliable and good for the study. A total of 126 questionnaire was administered by the researcher and three trained research assistants. At the end 118 instruments were retrieved representing 93.7 return rate. The research questions were answered with mean(x) and standard deviation while the hypotheses was tested using z test at 0.05 level of significance. Recommendation: university management should ensure reference resources are up-to-date in the library so as to encourage patrons to use the resources for research and information acquisition, university Library management should ensure that its staff develop positive attitudes towards reference services for effective dissemination of information on new trends in the library and university libraries should create awareness during orientation programmes about the availability of new resources and services or additions of new databases for user of the library. This will enhance users' use of the resources and services.