Book

Sudarso, Andriasan and Purba, Bonaraja and Ardiana, Dewa Putu Yudhi and Manullang, Sardjana Orba and Karim, Abdul and Purba, Pratiwi Bernadetta and Muliana, Muliana and Siagian, Valentine and Siregar, Muhammad Noor Hasan and Jamaludin, Jamaludin and Sudarmanto, Eko and Ashoer, Muhammad and Nugraha, Nur Arif and Septarini, Ri Sabti (2020) Konsep E-Bisnis. Yayasan Kita Menulis, Medan. ISBN 978-623-6761-53-3

Siagian, Valentine and Rahmadana, Muhammad Fitri and Basmar, Edwin and Purba, Pratiwi Bernadetta and Nainggolan, Lora Ekana and Nugraha, Nur Arif and Siregar, Robert Tua and Lifchatullaillah, Endang and Marit, Elisabeth Lenny and Simarmata, Hengki Mangiring Parulian and Prasetya, Agustian Budi and Purba, Bonaraja (2020) Ekonomi dan Bisnis Indonesia. Yayasan Kita Menulis, Medan.