Most of the articles or papers need to have a documentation support.
The context of disciplines can be diverse for example in engineering field if you need to develop an essay is necessary to investigate in the scientific community who is writing about the topic (state of art).
The APA standards does suggest to use the forms of documentation as:
In- text citation and work-cited list.
Example of in- text citation: The saw welding process is usually used in USA ( espinoza, 2018).
Example of work-cited list.
Bibliography.
1. James and dawson, inspection of pressure vessel to ASME Section VIII Div 1, presented at taking Pressure Vessel from Cradle to grave, Singapura, 2011.
Answer:
Most organizations have three management levels: first-level, middle-level, and top-level managers. These managers are classified according to a hierarchy of authority and perform different tasks. In many organizations, the number of managers in each level gives the organization a pyramid structure.
Standing water is not good for the environment so it needs to be vanished and shall no longer be around humans or animals that can catch the deadly disease malaria !
I think informal? Family members commonly use slang :)