What goes inside parenthetical citations?

MLA parenthetical citation style uses the author's last name and a page number; for example

Explanation:

After the fire, policies were created to implement the following reforms in the workplace:

Explanation:

The Triangle Shirtwaist fire was a major fire that occurred in 1911. The fire killed 145 workers, mostly women, but the most shocking thing about this incident is that the fire could have been completely avoided if the company's infrastructure were better and minimum prevention and safety factors. This made many policies mandatory within the industrial sector. All of these policies aimed to transform the working environment into something safer for workers.