Duffy, Gace L., Scott A. Laman, Pradip Mehta, Goving Ramu, Natalia Scriabina, dan Keith Wagoner.  2012.  Beyond The Basics: Seven New Quality Tools Help Innovate, Communicate, and Plan.  Http:/www. Asq-qm.org/resourcesmodule/download_resource/id/881/.

Guri-Rozenblit, S. (1989). Effects of a Tree Diagram on Students' Comprehension of Main Ideas in an Expository Text with Multiple Themes. Reading Research Quarterly, 24(2), 236-247. doi:10.2307/747866

Jones, E., Stanton, N. A., & Harrison, D. (2001). Applying structured methods to Eco-innovation. An evaluation of the Product Ideas Tree diagram. Design Studies, 22(6), 519-542.

Komariah Kokom. 2011. Penerapan Metode Pembelajaran Problem Solving Model Polya Untuk Meningkatkan Kemampuan Memecahkan Masalah Bagi Siswa Kelas IX J Di SMPN 3 Cimahi. Universitas Negeri Yogyakarta

Mauldin,R.D.,Sudderth, W.D., and Williams, S.C. (1992). “Polya Trees and Random Distributions,â€ The Annals of Statistics, 20, 1203-1221.

Paddock, S.M.(1999), “Randomized Polya Trees: Bayesian Nonparametrics for Multivariate Data Analysis,â€ Unpublished doctoral thesis, Institute of Statistics and Decision Sciences, Duke University.

Paddock, S.M., Ruggeria, F., Lavine M., and West, M. (2003), “Randomized Polya Tree Models for Nonparametric Bayesian inference,â€ Statistica Sinica, 13, 443460.

Putri Roza Gusnita dan kawan-kawan. 2012. Hubungan Kemampuan Kemampuan Berpikir Logis Dengan Kemampuan Menulis Karangan Argumentasi Siswa Kelas X SMA NEGERI 1 RAO Kabupaten Pasman. Universitas Negeri Padang

Rustini Tin. 2008. Penerapan Model Problem Solving untuk Meningkatkan Pengembangan Potensi Berpikir Siswa Dalam Pembelajaran IPS di Sekolah Dasar.

Samura, Asri Ode. 2017. Statistika Non Parametrik: Penggabungan Diagram Pohon Polya Yang Berhingga. Jurnal Euclid Vol 4 no. 2 tahun 2017. http://jurnal.unswagati.ac.id/index.php/Euclid/article/view/415

Shepherd, G. (2000).  The Probe Method: A Through Investigate Approach to Learning. [Online].Tersedia. http://www.unca.edu/edtech/probe2.htm. (3 April 2010)

Sutjiadi Darmawan Adhi. 2009. Aplikasi Network Pohon Dalam Tree Diagram. Institut Teknologi Bandung.