Iskandar, Y. (2004). Soal-soal Intelegensi Test/ Yul Iskandar. Jakarta: Yayasan Dharma Graha.
Lua i Stíl Chicago (17ú heag.)Iskandar, Yul. Soal-soal Intelegensi Test/ Yul Iskandar. Jakarta: Yayasan Dharma Graha, 2004.
Lua MLA (8ú heag.)Iskandar, Yul. Soal-soal Intelegensi Test/ Yul Iskandar. Jakarta: Yayasan Dharma Graha, 2004.
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