...A man's total years of fallen life in the fallen world may be thought of as his 'week' of toil, because, when a man dies, he no longer toils. So, however many years he lived, those are 'one week of years.' 'Six days' of toil.
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Adam lived 930 years of toil, or 'one week of 930 years'. So, each of Adam's 'six days' of years was 155 years.
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Now, in terms of textual reference of Adam's years of life, Genesis is book one (1), with chapter 5 and verse 5. That, too, is '155'.