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 Okada Y., 1951: Butterflies and Moths. Genus Lamproptera Gray. 8 pp. The Transactions of the Lepidopterological Society of Japan

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 Okajima S., 1976: Notes on the genus Stephanothrips Trybom (Thysanoptera, Phlaeothripidae) from Japan and Taiwan. 8 pp. Kontyu, Tokyo 44(4): 403-410.

 Okajima S., 1976: Notes on the Thysanoptera from the Ryukyu Islands. II. On the genus Stigmothrips Ananthakrishnan. 11 pp. Kontyu, Tokyo 44(2): 119-129.

 Okajima S., 1977: Description of a new species of the genus Hyidiothrips Hood (Thysanoptera, Phlaeothripidae) from Japan. 5 pp. Kontyu, Tokyo 45(2): 214-218.

 Okajima S., 1978: Notes on the Thysanoptera from Southeast Asia II. A new species of the genus Veerabahuthrips (Phlaeothripidae). 4 pp. Kontyu, Tokyo 46(2): 165-168.

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 Okajima S., 1978: Notes on the Thysanoptera from Southern Asia I. On the genus Podothrips Hood (Phlaeothripidae). 9 pp. Kontyu, Tokyo 46(1): 29-37.

 Okajima S., 1978: Notes on the Thysanoptera from the Southeast Asia III. Two new species of the genus Azaleothrips Ananthakrishnan (Phlaeothripidae). 7 pp. Kontyu, Tokyo 46(3): 385-391.

 Okajima S., 1979: A revisional study of the genus Apelaunothrips (Thysanoptera: Phlaeothripidae). 26 pp. Systematic Entomology 4(1): 39-64.

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 Okajima S., 1981: A revision of the tribe Plectrothripini of fungus-feeding Thysanoptera (Phlaeothripidae: Phlaeothripinae). 46 pp. Systematic Entomology 6(3): 291-336.

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 Okamoto C., Tsuda K., Yamaguchi D., Sato S., Pemberton R. W., Yukawa J., 2008: Life history and host specificity of the Japanese flea beetles Trachyaphthona sordida and T. nigrita (Coleoptera: Chrysomelidae), potential biological control agents against skunk vine, Paederia foetida (Rubiaceae), in the southeastern parts of the United States and Hawaii. 10 pp. Entomological Science 11(2): 143-152.