APA citation style refers to the rules and conventions established by the American Psychological Association for documenting sources used in a research paper
The Chicago Manual of Style Online is completely searchable and easy to use, providing quick answers to your style and editing questions. The Q&A content is fully searchable along with the content of The Chicago Manual of Style. The Chicago Manual of Style Online also provides convenient Tools, such as sample forms, letters, and style sheets.
MLA (Modern Language Association) style is most commonly used to write papers and cite sources within the liberal arts and humanities.
Sustainable Development and Biodiversity (Springer eBook Collection)
Sustainable Agriculture Reviews (Springer eBook Collection)
Sustainable energy developments (CRCnetBASE)
Sustainable urban areas (Ebrary)
Sustainability and the environment (Ebrary)
Sustainability, Economics, and Natural Resources (Springer eBook Collection)
World Sustainability Series (Springer eBook Collection)