Ellipses

Ellipses: Use ellipsis marks to show where words have been omitted from quoted material.

Original quote: According to National Audubon Society,

Wind power is currently the most economically competitive form of renewable energy. It provides nearly 15,000 megawatts of power in the United States, enough power for more than 3 million households, and could provide up to 20 percent of the country’s electricity needs. Every megawatt-hour produced by wind energy avoids an average of 1,220 pounds of carbon dioxide emissions. If the United States obtains 20 percent of its electricity from wind power by 2020, it will reduce global warming emissions equivalent to taking 71 million cars off the road or planting 104 million acres of trees.

MLA – wants brackets around ellipsis marks

One of the most promising advancements in alternative energy comes from wind power.  For example, according to National Audubon Society,

Wind power is currently the most economically competitive form of renewable energy. […] If the United States obtains 20 percent of its electricity from wind power […], it will reduce global warming emissions equivalent to taking 71 million cars off the road or planting 104 million acres of trees. (12)

APA – does not require ellipsis marks around brackets

One of the most promising advancements in alternative energy comes from wind power.  For example, according to National Audubon Society (2008),

Wind power is currently the most economically competitive form of renewable energy.… If the United States obtains 20 percent of its electricity from wind power…, it will reduce global warming emissions equivalent to taking 71 million cars off the road or planting 104 million acres of trees. (p.12)

The MLCKRB (Master List Code Key and Rule Book): An English Grammar & Style Handbook by Jared Aragona, CC BY 4.0