Gaya APA

Tondowidjojo, J. (2013). Enneagram in pupperty. Foreword: Julius Pour, Diah Madubrangti, Graham & Julia Eka Rini. . Surabaya: Surabaya Yayasan Sanggar Bina Tama.

Gaya MLA

Tondowidjojo, John. "Enneagram in pupperty. Foreword: Julius Pour, Diah Madubrangti, Graham & Julia Eka Rini. ". Surabaya: Surabaya Yayasan Sanggar Bina Tama, 2013. Buku.