The style most used for History is Footnote referencing.
This is where a number is allocated to each reference which is then listed in full at the bottom of the page (footnotes) or the section (endnotes). A bibliography is usually added at the end of the work which includes all the works cited. Examples of this style are MHRA and Chicago.
Traditionally the footnote style has been preferred in the humanities as it is less disruptive to the flow of writing.
In History it is recommended that students use the Essay writing guide for citing and referencing where examples of the two methods are described. For more detailed information and plenty of referencing examples refer to the relevant tab of the Citing and Referencing library guide.