Evaluation of the usability of the collection is an activity to assess the use of the collections contained in the library and have been developed in accordance with the objectives and applicable standards. This study aims to determine how the level of wearability of the collections of the Library Widyagama University in Malang using citation analysis in the Thesis of the Agribusiness Department of the Widyagama University of Malang. The method used in this research is descriptive quantitative with citation analysis approach. The population of this research is the thesis of the Department of Agribusiness in 2017-2021 with a total of 28 theses. Data collection techniques used are observation and documentation. The data analysis technique of this research is by analyzing the types of documents that are often cited, the rank of titles and authors that are often cited, the half of life and obsolescence of the cited books, the language of the cited books, and evaluation of the availability of the cited books. Based on the results of the study, students of the Agribusiness Department in 2017-2021 tend to use references that come from books. The most cited books are introductory books and research methods. Books cited by students as much as 51% or after have been considered obsolete. The language of instruction for the book cited is dominantly Indonesian. The level of usability of the collections available at the Library Widyagama University in Malang is still relatively low, only 18% of the cited books are available in the library.