What is how many ghost in christmas carol?

There are four <a href="https://www.wikiwhat.page/kavramlar/ghosts%20in%20A%20Christmas%20Carol">ghosts in A Christmas Carol</a> by Charles Dickens:

• The Ghost of <a href="https://www.wikiwhat.page/kavramlar/Jacob%20Marley">Jacob Marley</a>
• The Ghost of <a href="https://www.wikiwhat.page/kavramlar/Christmas%20Past">Christmas Past</a>
• The Ghost of <a href="https://www.wikiwhat.page/kavramlar/Christmas%20Present">Christmas Present</a>
• The Ghost of <a href="https://www.wikiwhat.page/kavramlar/Christmas%20Yet%20to%20Come">Christmas Yet to Come</a> (also known as Christmas Future)