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Espig, Gustav, Suherly, Lily. (1988). Ekologi . Jakarta: Yayasan Obor Indonesia.

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Espig, Gustav, Suherly, Lily. Ekologi. Jakarta: Yayasan Obor Indonesia, 1988. Text.

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Espig, Gustav, Suherly, Lily. Ekologi. Jakarta: Yayasan Obor Indonesia, 1988. Text.

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Espig, Gustav, Suherly, Lily. Ekologi. Jakarta: Yayasan Obor Indonesia, 1988. Print.