This is the first sentence of the self referential story.
This is the second sentence of the story, which refers to itself.

This is the third sentence, and also the first sentence of the second paragraph.
This is the fourth sentence, which refers to the sixth sentence.
Unsurprisingly, this is the fifth sentence of the story, which isn't referred to by the next sentence.
This is the sixth sentence of the story, which refers to the fourth sentence, and is, in itself, referred to by the fourth sentence.

This is the beginning of the third paragraph, as there is a change of subject.
This sentence comments upon the fact that I made a mistake in the fifth sentence.
This sentence is the longest sentence in the story, although to be fair it is separated into two parts by a comma which means it couldn't really been two smaller sentences.

This is the last sentence of the self referential story, except for these words:

THE END

Duncan's contribution to the Beige Book in the Bowling Alley series

It's a shame that paragraphs don't work at all in this wiki.