What Possessive noun with out add apostrophe and S?

The possessive form of a plural noun that ends with an s is indicated by adding an apostrophe (') only after the existing s.

Examples:

The sisters' names are Hope and Faith.

You select the ripe ones by the berries'color.

Some people prefer to use only an apostrophe (') to indicate possession for singular nouns that already end with an s, instead of adding an apostrophe s ('s). Both forms are accepted.

Examples:

Put the mail on the boss' desk. (Or, Put the mail on the boss's desk.)

Thomas' bicycle is new. (Or, Thomas's bicycle is new.)