Putra, Z.H. (2012). The Role of Models in the Development of Mathematical Strategies on Addition up to 20. Presenting at: International Seminar and National Conference on Primary Education 2012. Medan: Medan State University.

Putra, Z.H. (2012). Children’s Learning to Write Number Symbols (Numerals). Presenting at: International Seminar and National Conference on Primary Education 2012. Medan: Medan State University.

Putra, Z.H.,. Darmawijoyo,. Ratu I.I.P. & Jaap D. H. (2011). Supporting First Grade Students Learning Number Facts up to 10 Using a Parrot Game. Vol 2: 163 – 172. Indo-MS JME.

Putra, Z.H,. Darmawijoyo,. Ratu I.I.P. & Jaap D. H. (2011). Mpek-mpek Palembang Activity for Helping First Grade Students Learning Combinations that Make Ten. In: Prosiding Seminar Nasional Pendidikan 2011. Palembang: Sriwijaya University.

Kamaliyah,. Edo, S.I. & Putra, Z.H. (2011). Using String Beads to Support Students Understanding of Positioning Numbers up to One Hundred. In: Prosiding Seminar Nasional Pendidikan 2011. Palembang: Sriwijaya University.

Putra, Z.H. (2011). Design Research on Addition: Developing Mental Calculation Strategies on Addition up to 20 (Master Thesis). Palembang: Sriwijaya University.

Putra, Z.H. (2007). Menentukan Nilai Eigen Matriks Real Simetris dengan Metode Bisection (Determining Eigen Value of Real Symmetrical Matrices using the Bisection Method) (Bachelor Thesis). Pekanbaru: Riau University.

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