The book, A comparative study of style manuals: MLA Handbook for Writers of Research Papers and Publication Manual of American Psychological Association, is a comparison of 7th edition of MLA Handbook for Writers of Research Papers and 6th edition of The Publication Manual of American Psychological Association styles. These are the research document styles very popular among the researches of humanities and social science. The book will be helpful to the graduate and post-graduate students, teachers, scholars, researchers, academicians. The research work will be helpful in documenting sources both in humanities and social science.