Oentoro, Gabriel (2022) Analisis pengaruh convenience, design, trustworthiness, price, various food choices terhadap customer loyalty melalui perceived value dan attitudes towards food delivery apps pada pengguna grabfood di Surabaya. Masters thesis, Universitas Pelita Harapan.

Oentoro, Gabriel (2020) Analisis pengaruh personal need, site organization, user friendliness, efficiency of website, terhadap e-customer loyalty melalui e-customer satisfaction pada pengguna Grab di Surabaya. Bachelor thesis, Universitas Pelita Harapan.