A secondary source of is one
that was created later by someone who did not
experience first-hand or
in the
events or conditions. Secondary sources are
documents, texts, images, and objects about an
event
by someone who typically
referenced the primary sources for their information.
are excellent examples of secondary
sources.

Secondary data are data, which cannot be traced back to the level of individual cases of statistical units. In contrast to primary data it does not allow for mathematical calculations such as determining an arithmetic mean, a correlation, etc.

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must repent and believe in god.

or the book

journey across time - chapter 10 "the rise of christianity"