AndrewC. (2018). Secret world: A history of intelligence. Yale University Press.
2.
BeanH., de WerdP., & IvanC. (2021). Critical intelligence studies: Introduction to the special issue. Intelligence and National Security, 36(4), 467–475.
3.
BrissonB. (1595). De regio Persarum principatu libri tres. Hieronymus Commelinus.
4.
DaviesP. H. J., & GustafsonK. (2013). Intelligence elsewhere: Spies and espionage outside the anglosphere. Georgetown University Press.
5.
de GraaffB., & NyceJ. M. ed. (2016). The handbook of European intelligence cultures. Rowman and Littlefield (paperback in 2018).
6.
de GraaffB. (2017). Formerly secret intelligence becomes ubiquitous, it’ll disappear | Bob de Graaff | TEDxSittardGeleen. YouTube.com. 23February2017. https://www.youtube.com/watch?v=ccbDAXTnaRg
7.
de GraaffB. (2018). Less is more: A plea for epistemic restraint in intelligence. The Journal of Australian Institute of Professional Intelligence Officers, 26(2), 25–37. ISSN 1039-1525.
8.
de GraaffB. (2019). Intelligence and intelligence studies. Time for a divorce?Romanian Intelligence Studies Review, 21, 7–31.
9.
EvansG., & NewnhamJ. (1998). The Penguin dictionary of international relations. Penguin.
10.
KentS. (1949). Strategic intelligence for American world policy. Princeton University Press.
11.
MateiF. C., HalladayC., & EstévezE. E. (2022). The handbook of Latin American and Caribbean intelligence cultures. Rowman & Littlefield Publishing Group.
12.
NeedhamJ. (1971). Science and civilisation in China. Cambridge University Press.
13.
OlbrichtP. (1954). Das Postwesen in China unter der Mongolenherrschaft im 13. Und 14. Jahrhundert. Otto Harrassowitz.
14.
ParkesA. (2017). Lessons through Reform: Australia’s security intelligence. International Journal of Intelligence, Security, and Public Affairs, 19(3), 157–170. 10.1080/23800992.2017.1384675
15.
ShafferR. (Ed.). (2021). African intelligence services: Early postcolonial and contemporary challenges. Rowman & Littlefield Publishing Group.
16.
ShafferR. (Ed.). (2022). The handbook of Asian intelligence cultures. Rowman & Littlefield Publishing Group.
17.
SheldonR. M. (2005). Intelligence Activities in Ancient Rome: Trust in the gods but verify. Routledge.
18.
StoianV. (2023). The best of both worlds? A hybrid approach to intelligence and research. Intelligence and National Security, 38(4), 611–627. 10.1080/02684527.2022.2137152