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Akas, Pinaringan Sujalu and Eddy, Soegiarto and Titin, Ruliana (2021) Matematika Ekonomi. -, - (-). Zahir Publisher, Jogyakarta. ISBN 978-623-466-303-7
Andi, Indrawati and Ivana NE, Barus and Adisthy Shabrina, Nurqamarani and Danna, Solihin and Titin, Ruliana and Heriyanto, Heriyanto and Eka, Yudhyani and Mardiana, Mardiana and Rina M, Haryadi and Eddy, Soegiarto (2019) Pentingnya Segmentasi Pasar Dalam Menjalankan Usaha. Fakultas Ekonomi. (Unpublished)