"Advanced Checkpoint Feature". Merge pull request #18 from sunnyking/master. GitHub.org. Diarsipkan dari versi asli tanggal 2019-03-28. Diakses tanggal 28 August 2013.
"Advanced Checkpoint Feature". Merge pull request #18 from sunnyking/master. GitHub.org. Diarsipkan dari versi asli tanggal 2019-03-28. Diakses tanggal 28 August 2013.