According to Rostow’s (1959) model, The Stages of Economic Growth, it was a traditional society, a sugar-based monoculture where agriculture accounted for 25% of GDP (Lange, 2009).
"According to" could be better. It sounds like Rostow appraised the very society you're writing about. Also, the book is not a model.
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"According to" could be better. It sounds like Rostow appraised the very society you're writing about. Also, the book is not a model. Maybe "By Rostow’s model in his 1959 Stages of Economic Growth, it was a traditional society, a sugar-based monoculture where agriculture accounted for 25% of GDP (Lange, 2009)."
A book title takes italics. You drop an initial article from a title w