[header] How to cite a scientific journal [title] Give in-line reference numbers for citation-name or citation-sequence. [step] If you are using one of these systems, the only in-text information you need to provide is the location of the source within your reference list. [substeps] For example: tortoises are susceptible to a variety of ectoparasites, including ticks and cloacal mites. 
The format of the citation number may vary depending on the preferences of your instructor or editor. Citation numbers may be written in superscript or placed in brackets [] or parentheses ().