Does this need quotation marks or anything?

[0 answers]

I'm writing an essay, and a part of my passage is:

Morphology deals with the internal structure of words, particularly the grammatical units that compose words - known as “morphemes” (Trask, 1999). It is difficult to pinpoint the exact ages when morphology is acquired, however according to Brown’s Stages of Language Development, the appearance of morphemes in conversation begins at around 27-30 months (Owens, 2008).

Should Brown's Stages of Language Development be in " " or ' ' or italics or...?

Thankyou!!

[Kit]

It is fine the way it is.