Was the book anthem was written in third person?

It is hard to explain.

Not necessarily third person. But, instead plural. Singular is also occasionally used, but never in 1st person. So 1st person is used but never 1st person singular.

'We' is used. 'We' is 1st person plural.

'She' is also used which is 3rd-person singular.

'You' is used occasionally. Which is 2nd person singular

Until towards then end. In the end he discovers the Word 'I'. So first singular is then used.