One source uses 1861 as a start year, but other sources use 1866.

To avoid this issue, some sources use only the term character.

So it is unclear which source, if any, he could have used.

Once again, various sources may use units of different sizes.

However, some sources may use this symbol with the opposite meaning.

Some older sources used the name Polemoniales for this order.

No matter what their source, however, the translations of the texts used are my own.

Different sources still use the unofficial names in some contexts.

Older sources, particularly botanical works published before the 1950s, use a different convention.

Some sources use 4 instead of 0 for time; in this article, 0 is used.